->'''Time Agent 1:''' Captain, why did you take the ''Defiant'' back in time?\\
'''Sisko:''' It was an accident.\\
'''Time Agent 1:''' So you're not contending it was a predestination paradox?\\
'''Time Agent 2:''' A time loop - that you were meant to go back into the past?\\
'''Sisko:''' No.\\
'''Time Agent 1:''' Good.\\
'''Time Agent 2:''' We hate those.
-->-- ''Series/StarTrekDeepSpaceNine'', "Trials and Tribble-ations"

->'''Vanderbeam''': Wait! Where did you get [[TimeMachine this]]? I was too late to steal it!
->'''Vanderbeam''': I used this suit to steal the one I just gave to you.
->'''Vanderbeam''': But... then where did you get the one you're wearing?
->'''Vanderbeam''': My future self handed it to me two decades ago.
-->-- ''{{Starslip}}''

->'''Nagato''': Since there's no conclusion to the paradox theory, there's no way to prove there's no paradox.
->'''Kyon''': Maybe that's a good enough explanation for ''[[SufficientlyAdvancedAlien you]]''...
-->--''LightNovel/HaruhiSuzumiya'': Bamboo Rhapsody

->The idea here is that you can travel back in time, but you can't actually change history. So if you go back and try to prevent the assassination of [[UsefulNotes/WilliamMcKinley President McKinley]], it turns out that you killed him yourself. Or if you go back and try and prevent the Black Plague, it turns out that ''you'' are a [[TomatoInTheMirror flea-ridden diseased rat]].
-->--'''Lore Sj÷berg''', "Alt Text"

-->-- '''[[color:#008282:gallowsCalibrator/Terezi Pyrope]]''', ''Webcomic/{{Homestuck}}''

->''In fact that was even ''more'' puzzling, when Harry thought about it. Time had presented him with the finished Prank as a ''fait accompli'', and yet it was, quite clearly, his own handiwork. Concept and execution and writing style. Every last part, even the ones he still didn't understand.''
-->-- FanFic/HarryPotterAndTheMethodsOfRationality

->'''Idris:''' House eats [=TARDISes=].\\
'''The Doctor:''' House what? What do you mean?\\
'''Idris:''' I don't know, something I heard you say.\\
'''The Doctor:''' When?\\
'''Idris:''' In the future.\\
'''The Doctor:''' "House eats [=TARDISes=]"?\\
'''Idris:''' Oh! There you go.
-->-- ''Series/DoctorWho'', "The Doctor's Wife"

->''I am the Bad Wolf. I create myself. I take the [[ArcWords words]]... I scatter them. Across time and space. My message to lead myself here.''
-->-- '''Rose Tyler''' / '''The TARDIS''', "The Parting of the Ways"

->'''Goliath:''' If I didn't fear the damage you would do to the time stream, I would gladly leave you here.\\
'''Xanatos:''' But you won't, because you didn't. Time travel is funny that way.
-->-- ''WesternAnimation/{{Gargoyles}}''

->'''[[KidFromTheFuture Pierce]]''': "I don't believe you, causality is--\\
'''Volair''': Pick a number between ten and oh, sixteen.\\
'''Pierce''': Uh, twelve. Now--\\
'''Volair''': How old were you when I suddenly decided to paint the kitchen green?\\
'''Pierce''': Twel-- (look of sudden realization). Urk. Uh. muhh.. fuh..\\
'''Rhonda''': Told ya.
-->-- ''Webcomic/UmlautHouse''

->''"Don't do anything that affects '''anything''', unless it turns out [[YouAlreadyChangedThePast you were supposed to do it]], in which case, for the love of God, don't '''[[ConfusingMultipleNegatives not]]''' do it!"''
-->-- '''Professor Farnsworth''', ''WesternAnimation/{{Futurama}}'', "Roswell That Ends Well"

->''"Well, I guess that wraps everything up in a nice, [[TemporalParadox paradox]]-free bow"''
-->-- '''Professor Farnsworth''', ''WesternAnimation/{{Futurama}}'', "Bender's Big Score"

->'''1971 Robo:''' You're going to learn the ''hell'' out of hyperdimensional mathematics when you get back. Focus on electrodynamics.\\
'''1926 Robo:''' Why?\\
'''1957 Robo:''' So we'll know how to convert these burnt out powerpacks into a hyper-dimensional bomb to blow up the monster across multiple simultaneous points in space-time.\\
'''1926 Robo:''' How'd you know they burned out?\\
'''2009 Robo:''' Because we just ''told'' you, so you'll ''remember'' they are, so we can ''tell'' you they are. ''Dah!'' Study temporal mechanics while you're at it. Short version: when your future self tells you to do something, ''you do it.''
-->-- ''ComicBook/AtomicRobo and the Shadow from Beyond Time''

->''"No one can unmake the past. It's already happened, there's no 'undo'. Similarly, the future already happened. We just haven't '''reached''' it yet."''
-->--'''Sarda The [[AWizardDidIt Wizard Who Did It]]''', ''Webcomic/EightBitTheater'', "[[http://www.nuklearpower.com/2009/06/04/episode-1136-that-is-not-a-predictive-model/ That Is Not A Predictive Model]]"

->''"Though we can move through time, time itself is unmovable."''
-->-- '''[[spoiler: Young Xehanort]]''', ''VideoGame/KingdomHearts3DDreamDropDistance''

->If I ever invent a time machine, I'm going to stay as far away from myself as possible. If I were to have a conversation with myself, wouldn't I have to remember it perfectly, or else my memory of the conversation would be different from the actual conversation and it could result in a paradox that could destroy the universe? Unless, of course, I don't remember the conversation well enough to remember what future me was/is supposed to say. I guess my point is, don't go visit yourself yesterday. Wait a decade or two.
-->-- ''Webcomic/BobAndGeorge'' (author's commentary)

->"So there's this man. [[Series/DoctorWho He has a time machine. Up and down history he goes, zip zip zip zip zip, getting into scrapes.]] Another thing he has is a passion for the works of Ludwig van Beethoven. And one day he thinks, 'What's the point of having a time machine if you don't get to meet your heroes?' So off he goes to 18th-century Germany. But he can't find Beethoven anywhere. No-one's heard of him, not even his family have any idea who the time traveler is talking about. Beethoven literally doesn't exist. (This didn't happen, by the way. I've met Beethoven. Nice chap. Very intense. Loved an arm-wrestle.) No, this is called 'The Bootstrap Paradox'. Google it. The time traveller panics, he can't bear the thought of a world without the music of Beethoven. Luckily he'd brought all his Beethoven sheet music for Ludwig to sign. So he copies out all the concertos and the symphonies... and he gets them published. [[YouWillBeBeethoven He becomes Beethoven.]] And history continues with barely a feather ruffled. But my question is this. Who put those notes and phrases together? Who really composed Beethoven's 5th?
-->--'''[[Series/DoctorWho The Twelvth Doctor]] explains it perfectly in episode 9x04, [[http://tvtropes.org/pmwiki/pmwiki.php/Recap/DoctorWhoS35E4BeforeTheFlood "Before The Flood"]]'''