Before setting out on the path of revenge, first dig two graves.
— Chinese proverb
All they that take the sword shall perish with the sword.
— The Bible (King James Version), Matthew 26:52
"Isaac was my friend!" he cried, he begged them in his fear
But centuries of hatred have ears that cannot hear
An eye for an eye was all that filled their minds
And another eye for another eye, 'til everyone is blind
— Tommy Sands, ''There Were Roses"
"Revenge is like a ghost. Its thirst cannot be quenched... until the last man standing has fallen."
X: For every vengeance there is an equal and opposite revengeance. This is the one law of animated cartoon motion that also applies to the physical world at large. For that reason, we need the relief of watching it happen to a duck instead.
"Revenge is never full, it kills the soul and then poisons it."
— Don Ramon, El Chavo del ocho
Justice belongs to those who claim it, but let the claimant beware lest he create new injustice by his claim and thus set the bloody pendulum of revenge into its inexorable motion.
— Gowachin aphorism
"Perhaps it had to be done...but still, vengeance begets vengeance!"
—Travis Touchdown, No More Heroes
"Did you honestly think you could take so many lives and never suffer retribution? Have you never even seen a kung-fu movie, spy flick or western? Shakespeare, for God's sake! Not only did you murder my father, but my two brothers as well! That is why I took your best friend's life. Make sense, Travis? It's called poetic justice."
—Jasper Batt Jr., No More Heroes 2: Desperate Struggle
And in this mass-produced savagery, one truth is constant. With each shattered life, the same vow is uttered: "I will have revenge." And no assassin can ever walk away from that. He must draw his beam and stand against the madness.
—Opening Narration, No More Heroes 2: Desperate Struggle
"Grammy Flash used to say that the trouble with "an eye for an eye" is that everyone ends up blind."
"ENOUGH!! There will be no more bloodshed today. I see now why your Alliance and Horde cannot stop fighting. Every reprisal is itself an act of aggression, and every act of aggression triggers immediate reprisal."
—Taran Zhu, World of Warcraft: Mists of Pandaria
"Humans rejected your father and taught him to hate... then he destroyed me and I was filled with hatred as well! It's a vicious cycle that never ends, Nadira!"
—Fraxx, Power Rangers Time Force
Obi-Wan Kenobi: (about Melida/Daan) There are so many dead. But there's no clear reason why they fight. Battle follows battle, each one conducted to avenge the one before. What is the real dispute?
Qui-Gon Jinn: Perhaps they have forgotten it. The hatred is bred in their bones. Now they fight over meters of territory, or to avenge a wrong that happened a hundred years before.
—Jedi Apprentice, "The Defenders of the Dead"
When our guard is down, I think we'll both agree
That violence breeds violence
—It Has To Be This Way, Metal Gear Rising: Revengeance