Aizen Sousuke — memorable quote from Bleach

“Do you know what a scientist fears most in this world above all else? It's oblivion, my friend. A scientist measures our lives in the ways we develop and expand our knowledge through myriad variations. Nothing can take its place. It's our very soul. I have done the worst thing one scientist can do to another: I have altered your thought process. When my drug takes effect, you will find your mind has lost the ability to think.”

“Don’t be so stuck-up. Just enjoy this! Killing and being killed. They are just a way to pass time.”

“Don’t hesitate to cut the enemy. Don’t falter to finish them off. Much less heal their wounds. That’s unspeakable, nino. Leave the chocolate here. Become a demon, nino. As strong as a demon. As wicked as a demon. You have to learn that the only way to stand up against ruthlessness, is to become ruthless yourself.”

“The Killer instinct is not perceived by words, but by look”

“Listen up, kid. There's one thing you need to understand. Human life is a fragile thing. So weak that I can destroy it with a touch of my finger. So watch what you say. If you don't, I may break something I shouldn't.”