Hiei — memorable quote from Yu Yu Hakusho: Ghost Files

“You were wrong on two counts. Even the hardest substance can be broken, when crashed into itself. And the ability to feel pain is not a weakness. It’s a strength. Pain tells a creature its vulnerabilities, and not you expose them to attack. Your robot is dead. And so, I’m afraid, are you.”

“If you ask anyone to name a universal rule that governs animals and humans alike, I bet you most people would answer "survival of the fittest". There are strong people and there are weak people. At a glance, it looks like the difference is pretty clear-cut. But the truth is, there's a lot more to it than just a simple battle of "strong" against "weak", of kill or be killed. You must understand what I'm talking about too, right? The true meaning of "survival of the fittest" isn't as simple as all that.”

“Those who wallow in power are destroyed by it.”

“Only those who have suffered long, can see the light within the shadows”

“If you are weak, don't bare your fangs.”