For fictional examples, go to The Heretic.
- The Catechism of the Catholic Church has an official definition of heresy, which it juxtaposes against its definitions of incredulity, schism, and apostasy.
Incredulity is the neglect of revealed truth or the willful refusal to assent to it. Heresy is the obstinate post-baptismal denial of some truth which must be believed with divine and Catholic faith, or it is likewise an obstinate doubt concerning the same; apostasy is the total repudiation of the Christian faith; schism is the refusal of submission to the Roman Pontiff or of communion with the members of the Church subject to him" (CCC 2089).
- You may have noticed something important in that definition—the heresy is only a heresy when it knowingly and willfully contradicts established Catholic teaching, and a person is only a heretic if he/she holds a heretical belief and has had valid (i.e. Catholicnote ) baptism. The Catholic Church has a habit of not granting strict definitions to doctrine until it becomes a major issue, due to issues of opportunity and urgency—the divinity of Christ, while held and intuited by a large portion of Christians to varying degrees, wasn't formally defined until after Constantine legalized Christianity in the early 4th century, for example.
- This definition also clarifies the position of heretics vis-a-vis Catholics and other non-Catholics:
- A Catholic is one who believes in Church doctrine and recognizes the authority of the Church hierarchy.
- Someone who never believed in what the Church considers true Christian doctrine is incredulous. Thus most people born non-Christian or born Protestants (as they have strong disagreements on issues of doctrine and from the Catholic perspective are not considered to have had valid baptisms) are "incredulous" from the Church's point of view.
- Someone who has been validly baptized and believes in Church doctrine but does not recognize the authority of the Pope is schismatic. The clearest example of this is the Eastern Orthodox church, who agree with Rome on virtually every doctrinal point and whose baptisms are at least arguably valid from the Catholic point of view but disagree on whether Papal authority is legitimate. The status of the "Patriotic" Catholic Church in China is murkier. The communist government of the People's Republic has required Chinese Catholics to renounce the authority of the Pope even as they are allowed to practice their religion while subscribing to more or less the same doctrine as Catholics elsewhere (subject to change under demands by the Chinese government, e.g. on abortion and contraception—that's what the whole "Patriotic" business is about, being willing to bend tenets of their religion to requirements of the government, regardless of what foreigners like the Pope have to say.). Some Catholics consider the Patriotic Catholic Church schismatic, but the Vatican refuses to acknowledge the renunciation and maintains that the Catholic Church in China remains fully Catholic—or, in full communion with Rome, to use Catholic lingo—even if under complicated political circumstances that make formal ties with Vatican difficult and dangerous.note
- Someone who was baptized a Catholic (or, possibly, Orthodox), but has now abandoned Christianity completely is an apostate. This includes Catholics who convert to non-Christian religions (e.g. Kareem Abdul-Jabbar's conversion from Catholicism to Islam) and people who "convert" to atheism (e.g...well...half the famous "Catholics" in America, really). From the Catholic perspective, it also includes Catholics who convert to Christian sects the Church believes aren't really Christian because they diverge so fundamentally from its understanding of the Christian faith (e.g. William Laurence Sullivan'snote conversion to Unitarianismnote ). (A Catholic who converts to Mormonism—whose Christology and soteriology are singularly bizarre and thus whose position within the Christian tradition is unclear—might be an apostate under this definition.)
- And only someone who was at one point validly baptized and still considers themselves to be Christian—or even a Catholic—but disagrees with Church teaching on a point of fundamental doctrine is a heretic. For the most part, these are Catholic converts to some of the more-divergent streams of Protestantism (for instance, a Catholic who converts to Pentecostalism is likely to be labeled a heretic, since that sect is still identifiably Christian but differs fundamentally from Catholic teaching on soteriology, the sacraments, and other vital aspects of doctrine). On the other hand, it's not immediately clear that any Catholic convert to Protestantism is a heretic. In particular, a Catholic who converts to High Church Anglicanism might be seen as merely schismatic (given that the High Church interpretation of the "Real Presence" doctrine of the Eucharist is nigh-indistinguishable from transubstantiation, and there are no other major doctrinal differences between High Church Anglicanism and Catholicism). Conversely, Oriental Orthodox Christians, who differ with the Eastern Orthodox and Catholics on Christological matters, but whose baptisms might arguably be valid from the Catholic perspective for the same reason that Eastern Orthodox baptisms are, might be regarded as heretics rather than incredulous (which they would be if the Catholic Church regarded their baptisms as invalid) or schismatics (which they would be if their Christology was consistent with Catholic doctrine and Rome recognized their baptisms).
- NOTE: Since the following points illustrate the history of the Catholic Church's view of heresies, the point-of-view of the history and reasoning is Catholic. You have been warned.
- An early, biblical example: "But some men came down from Judea and were teaching the brethren, Unless you are circumcised according to the custom of Moses, you cannot be saved." -Acts 15:1. This counts as a heresy, in spite of its earliness, since it was previously established that God's grace could be applied to all regardless of circumcision. "And the faithful of the circumcision, who came with Peter, were astonished, for that the grace of the Holy Ghost was poured out upon the Gentiles also." -Acts 10:45 (Acts 10 is good for general context). Paul also has to deal with the Circumcisers in his Letters to the Romans and the Galations.
- Gnostic interpretations of Jesus' teachings were declared heretical (in fact, the very word "heresy" was popularized in the Christian world by Catholic theologian Irenaeus with his anti-Gnostic tracts), and Gnosticism in general also counts for:
- Its antipathy for the material universe, which contradicts God's satisfaction with his work as explicit in the first Creation story of Genesis.
- Instead of human beings being ontologically good creatures in and of themselves, they are spiritual creatures trapped in material form by the Demiurge.note
- Said antipathy for matter likewise denies the Incarnation, which denies Jesus the status of being both True God and True Man.
- The Demiurge is also claimed to be the true nature of the monotheistic deity worshiped by Jews, Christians, and Muslims, who falsely claims lordship over all existence and manipulates humanity into violence and misery for shits and giggles. And food. This contradicts the orthodox view of God's omnibenevolence.
- Marcionism, which may or may not be a form of Gnosticism depending on what definition is used, was a dualist belief that claimed that the wrathful Old Testament God is an inferior being to the loving New Testament God. Developed by Marcion of Sinope, who accordingly rejected all of the Old Testament and most of the New, keeping only the Gospel of Luke (heavily modified by him into the Gospel of Marcion) and St. Paul's letters. Having died in the early 2nd Century, Marcion is one of the very first declared heretics in the Church.
- Sabellianism was a 3rd century heresy that claimed God the Father, God the Son, and God the Holy Spirit were not distinct individuals who shared the same nature, but the same person doing different jobs. The heresy was also known as Modalism or Patripassianism ("the Father suffered", as a literal interpretation of Sabellianism would imply that God the Father also died on the cross). This doctrine is still affirmed by the modern Oneness (Apostolic) Pentecostal Church and certain Unitarians.
- Donatism was a 4th century heresy beginning in the wake of the Diocletianic persecution of Christians (the last official anti-Christian persecution in the Roman Empire) where many Christian clergy had apostatized or handed over holy items to the authorities as a result of coercion. After this, a dispute arose about whether the Bishop Caecilian of Carthage had been properly consecrated. His consecrators were alleged to be among those who had sinned by the acts mentioned previously during the Diocletianic persecution. Donatus Magnus ((270-355), for whom the heresy is named, led the party opposing Caecilian on this basis. They argued that if a clergy member was not in a state of grace, then any sacrament they performed was not valid. He was also consecrated as the Bishop of Carthage because of this and began to re-baptize and re-ordain allegedly lapsed clergy. Donatus was excommunicated for not only this view, but due to causing a schism in the Church. St. Augustine of Hippo (354-430) forcefully opposed Donatism, but it persisted even after being declared a heresy. It's unknown when it ended. Later in the Protestant Reformation, some Protestants revived it, causing the Catholic Church to condemn this again with the Council of Trent.
- A very famous example was given to the world in the teachings of Arius, who effectively used orthodox language to teach that Jesus was not divine, but a creature made by God. When Constantine legalized Christianity, one of the first things done by the leaders of the Church was to define and formalize what the belief system of Christianity actually held-Arius, who famously was supported by many bishops and excommunicated by others, gave an explanation of his beliefs to the Council of Nicaea in 325 and was solemnly condemned* ; the Council of Nicaea formally proclaimed the divinity of Jesus Christ. Arianism was also an issue at the First Council of Constantinople in 381, where the divinity of the Holy Spirit was also declared.
Arianism hung around long after this, however, having already been spread by the Gothic missionary Ulfilas to many of the Germanic tribes entering/invading the Empire in the 4th century. The Visigoths (in Spain), Ostrogoths (in Italy) and Vandals (in North Africa) would remain Arian for centuries, and the Vandals in particular made persecution of Nicene Catholics state policy for basically the whole existence of their kingdom. (This probably contributed to the bad press the Vandals got from the Catholic world.) The Visigoths and Ostrogoths also engaged in occasional persecutions to show the mostly Catholic locals who was in charge whenever they got uppity. Arianism only really faded away in the 6th century, after the Visigoths converted to Catholicism for political reasons and the Ostrogoths and Vandals were conquered by Justinian's resurgent Eastern Empire. However, hints of Arianism, or less specifically, non-trinitarianism, are still extant with modern day Jehovah's Witnesses and Mormonism, among other sects.
- Pelagianism was a 5th century heresy taught by, well, Pelagius, that declared humans morally neutral at birth, and that a human's righteousness or sinfulness was the result of the goodness or badness of the people around them, although goodness was defined as imitating the example of Christ. Pelagius denied the doctrine of Original Sinnote , which, when coupled with Pelagian teaching that Man could reach God under his own power, denied any functional role to God's grace in human nature outside of making holiness easier. Augustine later refuted Pelagianism, but their attempts to reconcile these contradictions led to a belief called "Semi-Pelagianism"... which ultimately landed it in the same boat as its predecessor, as it still held God's grace was not necessary for purposes of salvation (not to mention several other tenets), plus, while human effort alone could not merit the gift of God's grace, it could make some small claim on its receipt. Pelagianism was later revived by some small Protestant sects, and some of the mainstream ones sometimes had a hard time distinguishing themselves from it, as well. In particular, a prominent (if eccentric) Mormon theologian has argued that Mormonism is "entirely Pelagian" in its soteriology (officially, Mormonism is Arminian—which is also heretical from a Catholic perspective—but there's plenty of room for debate).
- Nestorianism, the teachings of Nestorius (there are several of these that share their author's name), and another 5th century issue, to boot, holds that the Virgin Mary was not in fact the Mother of Godnote , and only bore Christ's human nature in her wombnote A lot of people quickly recognized that this left two Jesuses running around, one man-of-woman-born and one divine, connected via some sort of loosely-defined union. The Council of Ephesus in 431 declared that it was indeed legitimate to refer to Mary as Theotokos, not because she predated or generated God, but because she bore God incarnate. There is some doubt as to whether or not Nestorius himself actually believed or understood the full ramifications of his statements; the Assyrian Church of the East, historically Nestorian, recently signed a joint document on Christology with the Catholic Church and now rejects Nestorianism.
- Monophysitism was largely concurrent with Nestorianism, mainly because it was a powerful reaction to and rejection of it. Horrified by the implications of two Christs running around, the monophysites basically leapfrogged themselves to the other end of the spectrum, claiming Jesus had only one naturenote , part divine and part human, something akin to a demigod. This was likewise rejected at the Council of Chalcedon on the grounds that, if Jesus was not fully human, he could not fully participate in and thus represent humanity, and if he was not fully divine, he could not fully participate in and thus represent God; in short, since he was neither truly God or truly Man, he could not join the two, and thus he could not fix the problem of Original Sin (see above), and humanity was still basically screwed.note
The modern day Oriental Orthodox church still affirms Miaphysitism, a moderate form of Monophysitism (or something entirely different, according to them). Very highly simplified, it holds that Jesus has one nature that is both entirely human and entirely divine. How this is at all different from the Chalcedonian position that Jesus has two natures united in one person ("hypostatic union") is the subject of heated academic debate; the possibility that it simply isn't has been suggested as a path to reconcile the two strains of Christology. In any case, the Miaphysite position became common if not standard among "Monophysites" relatively quickly, and so for historical purposes the two are lumped in with each other.
The endurance of the ancient division is largely a function of politics: the conflict between the Monophysites and the "Orthodox" (that is, the ones adopting the present Catholic—and Eastern Orthodox—Christology) was a hot religious and political issue during the early years of The Byzantine Empire, with Monophysitism being dominant in the empire's eastern provinces (Egypt and Syria, mostly, though it was also adopted by the churches of Armenianote and Ethiopianote ) and Orthodoxy being dominant in the west (in the Greek-speaking heartland of Anatolia and the Balkans/Greece). While the theological differences were genuine and often sincerely held, a lot of the actual heat was more reflective of the non-Greek-speaking East's desire to remain distinct in a Greek-dominated empire, as well as factional power politics; different Emperors backed Chalcedonian or Monophysite clerics at different times for political reasons.
However, when the Muslim Arabs abruptly conquered the eastern provinces, the conflict was basically frozen in the middle of the 7th century because the Caliph didn't care what these Christians believed about Jesus as long as they paid their taxes. The politico-theological games therefore ended with the result being that both groups exist as minorities in the mostly-Muslim Middle East while Orthodoxy stamped out the remaining Monophysites in the west as the political calculus changed (namely, the need to present a united Christian front against the expansionist Muslim Arab empire).
- Monothelitism emerged as an attempt at a compromise between the Orthodox position and Monophysitism. This doctrine asserted that Christ had two natures, both human and divine, but only a single divine "will" or "energy." While the doctrine gained some popularity, especially in Syria, it completely failed to mend the schism, because it didn't actually address the issue the two sides disagreed on (or, for that matter, the political issues that the theological dispute was so often a proxy for). Notably endorsed by Pope Honorius I, who was declared a heretic when the doctrine was condemned at the Third Council of Constantinople. This makes him one of the only Popes to officially be declared a heretic by the Church, though this occurred 40 years after his death.
- Iconoclasm ("icon smashing") first showed up in the 7th and 8th centuries. The essence of the claim was that it was sinful to make pictures or statues of Christ and the saints, based on the Second Commandment ("Thou shalt not make unto thee any graven image..."). The Catholic (and Orthodox) view is that God had commanded the creation of religious statues (Ex. 25:1820; 1 Chr. 28:1819), including symbolic representations of Christ (cf. Num. 21:89 w/ John 3:14). It was originally inspired by the Muslim blanket ban on representations of God and the Prophets (which often ended up as a blanket ban on representational art, just to be safe) and the Old Testament's emphasis against idolatry. Iconoclasts claimed that the Muslim eschewal of images was pleasing to God, as evidenced by the Muslims' military success against all enemies, or at the very least that Christian attachment to images had gotten out of hand and that God had sent the Muslims to punish the Christians for their crypto-idolatry.
Popular history associates this with Byzantine Emperor Leo III "The Isaurian", who had lived near the border with Muslim-ruled Syria, but although this has a grain of truth to it (Leo genuinely was not a big fan of icons), iconoclasm as imperial—and therefore Eastern Orthodox—policy was rather exaggerated by the generation that killed it (with the assistance of the Pope in Rome—at that time, again, the Church in Rome had not yet formally split from the Church in Constantinople, so this fight was basically one within Catholicism—albeit a Catholicism with a focus on the East, and one where the Pope was increasingly looking to escape from the Byzantine Emperor's shadow). A good bit of the issue was that icons tended to be richly decorated with gold, silver, and jewels; if the images were destroyed, the State could seize the precious materials, converting the metal into coins and selling the jewels for cash.note At the very least, iconoclasts argued, icons were a horrible waste of resources in the face of continuing Arab raids and repeated Arab attempts on Constantinople itself.
Iconoclasm, as a political issue in the Byzantine Empire, lasted from around 726 to 843, with a hiatus from 787 to 814, and wound up - essentially - as a wrangle between Church and State over Imperial power over the Church (the Church won).note Iconoclasm briefly reappeared in the initial stages of the Protestant Reformation mostly as a push back against the perceived decadence of the Catholics, but largely disappeared over the years, the only noticeable remnant being most Protestants' tendency to wear a bare cross instead of a Crucifix and building fairly austere and unadorned churches.
- Catharism's vogue was in the late 12th and early 13th century. Technically a mixture of non-Christian religions reworked with Christian terminology, there were a few joining principles that connected the various sects under the name. Very similar to Gnosticism above, the Cathars held a fierce antipathy for the material universe, which they held was created by an evil deity (hence, matter is evil), but there exists a Good Deity who should be worshiped instead (there's a resemblance to Zoroastrianism here). One of the largest Cathar sects was the Albigensians, who wielded a great deal of power in southern France during the 13th century, before being obliterated by the French crown and various crusaders in the Albigensian Crusade. They held that the spirit was created by the good God, but imprisoned by the evil one in a physical body. Hence, the bearing of children - the imprisoning of another human soul in a body - was one of the greatest possible evils; logically, marriage and vaginal sex was forbidden, but anal sex might be technically permissible. Since Catharism was believed to have arisen in Bulgaria (among other things, it was connected to another Gnostic sect, the Bogomils), they were also called bougres ("Bulgars") in French, from which we get "bugger" and "buggery" for "anal sex" or someone who practices it. They weren't all about the buggery though; there were plenty of fasts that bordered on wilful starvation and lots of severe mortification was practised. Leaders went about in voluntary poverty. Some sects also seemed to believe in ritual suicide, fasting to death after they had been purified.
- Protestantism: You've probably heard something about a Reformation in the 16th century, in which thousands of Christians broke with the Catholic Church. Protestantism is not a specific doctrine or belief-set but rather an umbrella term for thousands of different theological divisions (which can generally be un-splintered into less than two dozen religious "traditions"), that share doctrines of Sola Scriptura (theology should be formed solely by consideration of scripture) and Sola Fide (human beings are justified "by faith alone")* . The great diversity of Protestantism has two primary roots: a general distrust for human authority and the "doctrine" of private judgment, the latter of which denies the Church its claim to the infallible right to interpret Scripture, and indeed pits the Church against Scripture.
As a point of clarity, while Protestantism is in fact considered a heresy, most Protestants are not considered heretics. Since they were never Catholic in the first place, and because Protestant baptisms are not generally recognized as valid by the Catholic Church, being a Catholic heretic is rather impossible. A convert from Catholicism to Protestantism might be considered a heretic if the particular Protestant sect largely agrees on doctrine but differs on a few key points (e.g. if someone converts from Catholicism to High Church Lutheranism, which is mostly like Catholicism but still holds to the same ideas that made Luther a heretic). Additionally, the position is somewhat complicated by Anglicanism, especially as practised by the Church of England, which was originally intended as - basically - Catholicism where the Church reported to the King, Henry VIII, rather than the Pope. Even today, the High Church part of the C of E bears a great deal of resemblance to Catholicism. The transition to a fully Protestant church under subsequent monarchs, and the according changes in doctrine, ritual, and teaching, have derailed attempts at reproachment. The official position of the Church is that it is "both Catholic and Reformed", i.e. a Protestant church that looks Catholic. There have been movements within the Church of England to more greatly emphasize its Catholic heritage, but the clerics involved tend to either stop short of fully embracing Catholic doctrine or simply convert to Catholicism. One of those movements was the Oxford Movement, which featured the theologians such as Edward Bouverie Pusey and John Henry Newman. Newman himself would eventually convert to Catholicism, to the shock and outrage of the Church of England.
- Jansenism — 17th century. Cornelius Jansen, the bishop of Ypres in what was then French-controlled Flanders (it is today in Belgium), wrote a paper on Augustine that redefined the doctrine of grace. The Jansenists were a rigorist sect that taught, basically, an adaptation of the Calvinist Protestant soteriology to Catholicism. (Considering that Jansen was originally from the Netherlands, where Calvinist Reformed Protestantism was strong, this is hardly surprising). In this book, Jansen states that man's free will is incapable of any moral goodness. All man's actions proceed either from earthly desires, which stem from concupiscence, or from heavenly desires, which are produced by grace. Each exercises an urgent influence on the human will, which in consequence of its lack of freedom always follows the pressure of the stronger desire. Implicit in Jansenism is the denial of the supernatural order, the possibility of either rejection or acceptance of grace. Accordingly those who receive the grace will be saved; they are the predestined. All others will be lost. Jansenism was condemned as heretical in five major propositions by Pope Innocent X in 1653. It was re-condemned by Pope Alexander VII in 1656, when Jansenists claimed that their doctrine was misrepresented.
- Modernism — Late 19th to early 20th century. Modernism is a theological movement spearheaded by Fr. Alfred Loisy and Fr. George Tyrell. It takes its cues from liberal Protestantism and early modern philosophy like those of Kant and Hegel, and it teaches that the Christian faith is all based on personal religious experience, individual and collective, and under the influence of the current age. This means that the Church's dogmas can evolve over time, meaning one thing in a certain context and another thing in another. It also proposes that the Catholic Church is not divinely instituted by Christ, but rather a merely human institution. This school of thought effectively denies the supernatural in general and divine revelation in particular. Pope St. Pius X vigorously condemned Modernism as a heresy in 1907 with the publication of the encyclical "Pascendi Dominici Gregis". In 1966 onwards, Modernism has resurfaced under the influence of theologians such as Hans Kung, Edward Schillebeeckx, and Charles Curran, denying papal and scriptural infallibility, rejecting Catholic teaching on contraception, and endorsing the ordination of women into the priesthood. These theologians have been censured by the Church and prohibited from presenting themselves as Catholic theologians.
- Americanism — A lesser known heresy, largely due to how oddly specific it is, condemned by Pope Leo XIII in a papal encyclical and a letter to Archbishop of Baltimore, the de facto leader of the Church in America. Americanism was the belief that, due to the political and customary uniqueness of the country, different religious rules applied to American Catholics than to Catholics elsewhere. Put more bluntly, it was the idea that American Catholics were free to decide for themselves which Church doctrines they believed, due to the American promise of religious liberty. Leo was particularly concerned about the American tendency to blithely ignore the Church's social teachings —- particularly concerning divorce and economics — and the American attitude towards the vowed priesthood and other religious institutions, which skewed towards the Protestant side of things. These tendencies were particularly prevalent among second and third generation Irish immigrants, whose desire for assimilation often meant novel interpretations of the religion that were more friendly to American culture and politics. The leaders of the American church were, as you might expect, not terribly flattered by this characterization and denied that it had merit. As a result, there is still debate today about whether Americanism is a genuine heresy or not (which is not helped by the fact that Pope Leo himself vacillated on the issue somewhat).
- Feeneyism — Quite possibly the youngest heresy on this list, and one of the few true American-born heresies, this one erupted sometime around World War Two, when Fr. Leonard Feeney, a Jesuit priest, began to preach a very distorted version of the Church tenet extra Ecclesiam, nulla salus, or "No salvation outside the Church." Feeney taught this to mean essentially that everyone not a formally baptized Catholic was without doubt going to, or already had gone to, Hell. note The implications of Feeney's belief were odious — that millions of souls who existed either before Christ or before the Church reached them were damned out of hand by God himself even though they had no chance to receive baptism. It also didn't help that Feeney was apparently an anti-Semite, rivaling the more well-known Fr. Charles Coughlin of Detroit in intensity. He also mocked a previous Pope, Pius IX, for claiming that unbaptized babies could be saved due to having no personal mortal sins on their soul at the time of death, calling Pius IX, a beloved Pope, a heretic. Finally, his interpretation of nulla salus was NOT from any magesterial note authority, but from his private interpretation of Scripture. In the end, Feeney was ordered by Pope Pius XII to knock it off and come to Rome to explain himself, and when he refused, he was dismissed from the Jesuits in 1949 and ultimately excommunicated in 1953, an excommunication only lifted as recently as 1972.note
- The teachings of Jan Hus, namely, his condemnation of the corruption of the church, and his tenet that Scripture, not the Pope, was the ultimate authority in matters of religion, got him branded as a heretic and executed. He was Vindicated by History nowadays, since the church is nowhere near as powerful in society now as it was back then, and there are plenty of Christians or Catholics who don't follow the Church's teachings to the letter nowadays.
- "Galileo was famously tried before a court for an issue regarding the veracity of heliocentrism" is about as neutral as the pop cultural understanding of the actual sequence of events is likely to get; most people seem to think Galileo was declared a heretic. Let's start with the context:
- In Galileo's day, heliocentrism was actually gaining considerable consideration when considering the motion of the stars from an earthly perspective. A Catholic cleric named Nicolaus Copernicus (for whom is named "The Copernican Revolution") famously brought heliocentrism into vogue. He wrote a long text on the subject, On the Revolution of the Celestial Orbs, but put it into the care of a Protestant friend to be published after his death (the book, which contains an excellent account of heliocentricity, was dedicated to Pope Paul III). The friend, a Lutheran clergyman named Andreas Osiander, anticipated the massive ramifications this theory had for Protestant scriptural interpretation (Martin Luther seemed to condemn the new theorynote ) and, the likelihood that it might be condemned; to counter this, Osiander prefaced the book with the claim that the descriptions within were theoretical only, and were only employed to simplify computations... something Copernicus never intended.
- Another proponent of heliocentrism was Johannes Kepler, a Protestant who expounded on Copernicus' work; Kepler, who did not couch his developments, faced opposition from fellow Protestants, but found a welcome reception from a number of Jesuits notable for scientific achievement.
- It is commonly assumed that Galileo proved heliocentrism — he didn't, exactly. He merely made the biggest noise about it. He started by writing a letter in response to the Grand Duchess of Tuscany saying, in effect, "Well, I wouldn't put too fine a point on it, but yes, the evidence does suggest that, scientifically speaking, the Church and Aristotle really do have the whole structure of the Universe wrong." Notice all the hedging: Galileo was convinced, but knew he didn't have definitive, incontrovertible proof. His observation that Venus has phases made it extremely unlikely that geocentrism was true and heliocentrism false, but there were all kinds of other explanations that could have been cooked up to keep the Earth in the middle, even though they were all sort of ridiculous.
The issue was that proponents of heliocentrism were unable to counter the strongest argument against it, which had been proposed by Aristotle himself—if heliocentrism were true, there should be observable parallax shifts in the position of the stars as the Earth moved. Now, there are observable parallax shifts, but the technology to demonstrate that hadn't been developed until the eighteenth century—decades after Galileo's death.note . Until that point, the evidence suggested that the stars' positions were fixed relative to the Earth, and thus, only the Sun, Moon, and other planets were moving. Copernicus' (correct) explanation that the stars were too far away to exhibit visible parallax was not accepted, even by non-geocentrists like Tycho Brahe. Scientists back then, more used to the smaller-sized universe proposed by Aristotle and Plato, fundamentally had trouble wrapping their heads around the actual size of the universe and the vast distances between celestial objects, and proposed a "geoheliocentric" system in which the Sun, Moon, and stars revolved around a stationary Earth, while almost everything else either revolved around the Sun or revolved around something that revolved around the Sun. This system "worked" inasmuch as it didn't contradict the observed evidence (until the parallax shifts were observed), but was criticized for being more complicated and less elegant than pure heliocentrism. Galileo adopted this critique, but tried to remain restrained in his opinions in the letter to the duchess. However, being a bullheaded and rather stubborn sort of fellow, Galileo later doubled down on heliocentrism, and that got him in trouble.
- Mind you, Galileo had a critical role in putting a dent in geocentrism. His discovery of The Moons of Jupiter made the Aristotelian theory that much more difficult to defend—if everything was supposed to go around the Earth, why did these four things go around Jupiter instead? And Galileo and other astronomers of his era kept making similar discoveries, particularly (although not necessarily) after they followed his lead in pointing telescopes at the heavens: if the celestial bodies were supposed to be perfectly spherical, why does the Moon seem to have mountains? Or the Sun seem to have spots? (See below for the bad blood that raised.) And why, pray tell (as mentioned) did Venus have phases when you looked at it through a telescope? (The math means that if Venus has phases, things have to be pretty wonky up there if everything revolves around the Earth, with the Tychonic geoheliocentrism being the least-wonky.) And perhaps most significantly of all, why did Brahe—working without a telescope—see a new star (really the supernova SN 1572), when both Aristotle and Church doctrine said that the stars were perfect and thus a new star was impossible? And eighty years later, Edmund Halley noted that even the stars were moving—Sirius, Arcturus, and Aldebaran had moved half a degree since the time of the Classical astronomers and their star charts. Finally, about a century after that—at which point everyone with an education accepted heliocentrism already—someone finally measured the parallax of a star, using a device that amounted to a telescope with extra measuring equipment attached. And that was that for geocentrism.
- Note also that the Church was in the process of figuring out how to reconcile heliocentrism with their theological teachings, just in case something (e.g. the eventually forthcoming proof of Copernicus' theory that the stars are really far away) made it impossible to argue against heliocentrism on the facts. They'd done this kind of dancing before, and to quote James Burke, explaining away a heliocentric universe would be a "mere bagatelle"—in other words, heliocentrism wasn't a serious threat to orthodoxy. They had gotten pretty far, but weren't quite ready, and thus got annoyed when Galileo started yelling about it. When the aforementioned letter to the Grand Duchess of Tuscany was first shown to a Churchman, the Church's message to Galileo was, in effect, "Would you quiet down a bit? This business is undermining Church authority. It's not that we think you're wrong; it's that you can't tell the people about this right away. Give us time to feed it to them slowly."
- Unfortunately for Galileo, as we said above, he doubled down on heliocentrism and argued against the literal interpretations of the Bible in the non-theological arena, as it contains passages that explicitly contradicted heliocentrism (the most quoted being the one where Joshua commands the Sun and Moon to stand still over Canaan).note Taking to the debate floor, he insisted that the Bible and nature must agree as both proceeded from the same creator, and began insisting Scripture be reinterpreted to suit the theory he couldn't quite prove. Just to make it worse, as Europe was in the midst of the Thirty Years' War, which pitted basically all the Catholic powers of Continental Europe against basically all the Protestant ones, everyone was a bit touchy about religious doctrine, and Galileo's abrasive personality and previous clashes with Jesuit scientists really weren't helping his cause. In 1616, he appeared before Pope Paul V; the pope, weary of controversy, turned things over to the Holy Office, which condemned the theory. Later, Galileo made a request of a friend - Cardinal Robert Bellarmine, a Jesuit; he was granted a certificate that allowed him not to hold or defend heliocentrism, but to conjecture it. Later, he met with another pope (and a personal friend), Urban VIII, in 1623. The Pope granted Galileo permission to write on the subject, cautioned him not to advocate it, instead presenting the arguments for or against it. Not happening. What Galileo actually wrote (in the form of a dialogue), while technically presenting the arguments for both sides, was clearly in favor of heliocentrism, and the arguments against it — including the ones offered by his friend the pope — were placed in the mouth of the character named "Simplicio" (i.e. "Simpleton"), who was a debater of obviously inferior intelligence and status than the one arguing heliocentrism. Galileo however claimed Simplicio was actually named after Simplicius of Cilicia, a sixth-century commentator on Aristotle. It's not entirely clear if this is true or he was simply trying to backpedal; given his personality, both are about equally possible.
- The Vatican assigned two Jesuits, Christoph Scheiner and Orazio Grassi, to look into Galileo's science. Both had solid credentials as astronomers. However, Galileo had managed to alienate both of them. Schiener was one of the first astronomers to observe sunspots and was, as far as he knew, the first to describe them in a scientific paper (in fact, the first paper on sunspots was published the previous year by David Fabricius, but his paper was unknown outside of Germany.) Galileo attempted to grab the glory of having first seen sunspots from Scheiner, and compounded this by plagiarizing Scheiner in his own paper. Grassi and Galileo disagreed on the nature of comets. What made things interesting was that Grassi was right and Galileo was wrong. Grassi had observed a comet over a period of time, and had noticed that the moon moved faster in the sky than the comet did; Grassi correctly assumed that the comet was further from the Earth than the moon was. Galileo believed that they were optical illusions in the atmosphere. Galileo wrote an essay, Il Saggiatore — "The Assayer" — attacking Grassi and his theory. This essay is still taught in Italian schools as a masterpiece of polemical writing. Naturally, having been held up to ridicule, Grassi was no friend to Galileo.
- Having publicly mocked the Pope, alienating the Jesuits to boot with attacks on two of their astronomers, Galileo's actions resulted in the famous trial. In course of the trial, Galileo stayed in fine quarters at the Apostolic Palace while his meals were prepared by the best chef in town. While he eventually recanted his teachings, he was not tortured (he was only threatened); he was actually merely placed under house arrest, at a fine mansion in the countryside belonging to a friend... and given a manservant. Galileo was not explicitly declared a heretic, though he was found to be "vehemently suspect" of it; the testimony from his trial (Galileo was tried before an ordinary tribunal) was brought before a group of ten cardinals. Three of them refused to sign his verdict, but his works were eventually condemned.
- To keep it short, the Church of Galileos day issued a non-infallible disciplinary ruling concerning a scientist who was advocating a new and still-unproved theory (and one unprovable with the technology of the time at that) and demanding that the Church change its understanding of Scripture to fit his hypotheses about nature (which it was quietly in the process of doing anyway but wasn't ready to go public yet). At the end of the day, the entire fiasco boils down to an overgrown squabble involving a cranky old man with very powerful friends and a bunch of annoyed bigwigs who decided to cut him down to size. However, the Catholic Church acknowledges its mistake, and has for some time. In 1741, Pope Benedict XIV granted an imprimatur to the first edition of the complete works of Galileo. In 1757, a new edition of the Index of Forbidden Books allowed works that supported the Copernican theory, as science had reached the point where the theory could be proven. Pope John Paul II famously apologized for the fiasco, but there was a second, less well-publicized apology issued about a century earlier; also, the Church has published two stamps in his honor.
- Joan of Arc, famous war hero in the conflict between the Armagnacs (a party which included Charles VII of France) and the Burgundians in alliance with the English, was also examined for any possible heretical beliefs.
- Now, this was by her English captors (with support from the University of Paris, which had English loyalties), who were absolutely desperate to be rid of her — the original round included seventy wild accusations, though they were later replaced with twelve less ludicrous tales and the declaration that the voices guiding her were demonic. When she refused to retract "her wrongs" (which primarily consisted of kicking a lot of English ass), she was threatened with torture and with having her case turned over to the secular authorities (i.e. to let them burn her). At one point, Joan of Arc asked to have her case taken to the Pope himself, and was denied.
- At one point, her courage did manage to fail her, and she recanted-the official record of the retraction is long (a half-hour read at least) and humiliating in every way possible (and likely more of the same bull; every other account of the retraction mentions she signed a document only a few lines long, including the account from the man who read it to her). Even so, her signature was conditional, only insofar as "it was God's will". Safe for the moment (though her captors were furious), Joan was now stuck in the most dangerous of situations-if she reversed herself on her "recanting", she would be doomed.
- One of the crimes of which she had already been "condemned" was that of dressing like a man, and it was on this that the English finally slew her, by laying a trap. The reasons for it vary-she may have been trying to protect her modesty from outrage, or her original women's clothes were taken from her, or possibly because she was tired of the ridiculous charade she put on the man's clothes which had been deliberately left for her. In wearing them, she was found and declared to be a "relapsed heretic", and burned the next day (May 29 and 30, 1431; she was 19 years old).
- 24 years later, her case was reopened, this time with the actual consent of the actual Holy See and the actual attention of the actual pope (as opposed to the original bunch of English bishops led by Pierre Cauchon, Bishop of Beauvais); both the Church and the King of France took a few knocks at the second trial for letting the travesty go so long without addressing it, which speaks well for the second trial's sincerity. However, the common view of her in England (even through the age of Shakespeare) was that she was a witch in league with demons. She was not commonly regarded as sympathetic until the 19th century-compare France, where the opinion that she was divinely inspired was held even during her own lifetime. The case for her canonization was opened in 1869, she was beatified in 1909, and finally declared a saint in 1920.
- Islam has very strict instructions on what its followers should and shouldn't do, and practices that can't be traced back to the Prophet Muhammad himselfnote are regarded as heretical, or bid'ah-literally meaning "innovation" (since the religion is considered to have been perfect when revealed, so anything added later would make it less perfect; "bid'ah" outside of religion is OK, although usually other terms are used).
- Ahmadiyyah. Its followers believe that the aforementioned Ahmad is also a Prophet, which goes against the role of Muhammad as the final prophet bringing final scripture. Numerous conflicts, some of which were violent, have happened between Ahmadiyyah and the more mainstream Muslims. It doesn't help that it originated during the British Colonial era and the early followers had ties with the Colonial authority-the present headquarters of the Ahmadiyyah are in the UK.
- Sufism. A rather loose term for sects than put more emphasis upon the spiritual experience and, usually, are less strict on religious laws. It might have been influenced by Hindu mysticism. Sufi imams have considerably greater influence on their followers than the mainstream imams. Their departure from what mainstream Muslims consider within bounds varies, and reactions from mainstream Muslims vary between "that is actually kind of legitimate, even if I don't exactly agree" to "let those eccentrics be" to "those are pseudo-Islam, exterminate them." The first attitude is most common among poorer, less educated Muslims, since Sufism is similar to the folk Islam they practice (loaded with saints and shrines and so on), while higher-class/more educated Muslims tend to gravitate toward the second interpretation (essentially regarding Sufism as a somewhat overblown but still basically orthodox and more or less harmless version of folk Islam), and the ultra-purist Wahhabis love knocking down Sufi sites whenever they get a chance.
- Sunni and Shi'a Muslims don't generally regard each other as heretics. The difference was mostly a political one rather than a theological one. Comparison can be drawn between Catholicism and the Eastern Orthodox Church, more or less. Let's leave it at that.
- And finally, all three of the Abrahamic religions "tolerate" (or not) each other to various degrees, they only thing they can agree on being their mutual distaste of polytheism.note Let's leave it at that.
- The original Nazarene sect was considered a heresy in Judaism. Once they started recruiting non-Jews without putting them through the proper conversion, Christianity became a distinct religion. Modern Messianic Judaism is considered a heresy. What sealed the break was the expelling of the Christians from the synagogues in AD 82. Up until this point, relations were tense, but it was still a common practice for an Israelite Christian to go to the synagogue on Sabbath morning, and then go home, rest up, and attend Mass in the evening. After the expulsion, Christians no longer regarded themselves as a sect of Judaism, even if they were born Jews.
- Karaism is a sect of Judaism that rejects the Oral Law, and accepts only the Written Law. There are still a handful around today.
- The Essenes were a sect contemporary with Jesus that believed in a spiritual war between good and evil. They are best known for writing the Dead Sea Scrolls. (No, not those.)
- Pre-Christian example: the 18th-dynasty pharaoh Akhenaten radically and single-handedly overhauled the Egyptian religion from polytheism into sort of a proto-monotheism. He got away with it at the time because, well, he was the king, but the religion reverted immediately after he died and Akhenaten got the Un-person treatment from his successors.