"Revolving. And each time it's touched by the light of the sun and moon... The world is always changing into something new."

"[to Szayel Aporro Grantz] Immaculate being... Was it? In this secular existence, perfection is an illusion, regardless of those who utter the contrary. This is the reality. Common man seeks it out, they strive to achieve it, as if it were some tangible thing... But... The fact of the matter is, perfection is a hollow shell. It is devoid of any substance. I spit on perfection. Perfection, after all, implies you've reached the summit. No trial and error, no ability to conceptualize. An omniscient being would have no need for such superfluous things... Am I making myself clear? For people who dabble in the sciences, such as ourselves, perfection would make us obsolete. Many magnificent things have been, and will continue to come into existence... And yet every last one of them will fall short of perfection's finish. Our function as men of science relies on their many shortcomings. Then, and only then, can we apply the fruits of our labor. To put it simply... As soon as you began spouting that nonsense about being an immaculate being... your fate was sealed. How dare you call yourself a man of science?"

"Live well, Ichigo. Live well, age well, go bald well, and die after me. And... if you can, die smiling."

"[To Orihime, when she refuses to eat] Shall I force it down your throat? Or would you rather be strapped down and given IV's?"

"[Referring to Tosen] He's such a boy scout, wouldn't you agree?"

"How I envy the feeble and frail... If I were inept, I could simply blend in, not stand out, and get lost in the crowd. I yearned to be just another sheep... And if that was asking too much I'd settle for... walking among the lions."

"I placed this blade of grass in my mouth thinking I'd look cool. But it must be poison 'cause ith makinth ma mouth numb."