Quotes, eh? well more than that, there are a couple of dialogues that I love.
"
Kain: Thirty years hence, I am presented with a dilemma... let's call it a two-sided coin. If the coin falls one way, I sacrifice myself and thus restore the Pillars... but as the last surviving vampire in Nosgoth, this would mean the annihilation of our species... Moebius made sure of that. If the coin lands on the reverse, I refuse the sacrifice and thus doom the Pillars to an eternity of collapse. Either way, the game is rigged.
Raziel: We agree then that the Pillars are crucial and must be restored.
Kain: Yes, Raziel, that is why we've come full-circle to this place.
Raziel: So after all this, you make my case for me. To end this stalemate, you must die so that new Guardians can be born.
Kain: The Pillars don't belong to them, Raziel... they belong to us.
Raziel: Your arrogance is boundless, Kain.
Kain: There's a third option, a monumental secret hidden in your very presence here. But it's a secret you have to discover for yourself. Unearth your destiny, Raziel. It's all laid out for you here.
Raziel: You said it yourself, Kain... there are only two sides to your coin.
Kain: Apparently so, but suppose you throw a coin enough times... suppose one day, it lands on its edge."
-Legacy of Kain: Soul Reaver 2
"Hate is a place where a man who can’t stand sadness goes".
There's actually a second part of this, but appearently I can't find the correct english translation, so I'll try to translate it from my language
"Getting revenge is like sharpening a blood-rusted sword sinking it in a pool of blood.To reforge your hearth's blade, rusted by sadness, you're plunging it in blood. But the more you sharpen it, the more it rusts, and the more it rusts, the more you sharpen it. In the end, you'll remain with a pile of rust"
-Godor the blacksmith, Berserk
"Pirates are evil? The Marines are righteous? These terms have always changed throughout the course of history! Kids who have never seen peace and kids who have never seen war have different values! Those who stand at the top determine what’s wrong and what’s right! This very place is neutral ground! Justice will prevail, you say? But of course it will! Whoever wins this war becomes justice!"
-Donquixote Doflamingo, One Piece