"That's enough, Soifon. You remind me of myself. I even think of you sometimes as my little sister."

"I didn't come here to fight! I came here to hack at you violently!"

"[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?"

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

"Any betrayal you can see is trivial, what is truly frightening and much more lethal, is the betrayal you cannot see."

"[in reply to Shunsui Kyōraku] It's true, I know nothing about her (Rukia). It might not be quite enough for me to risk my own life over. But...Ichigo wants to save her. That reason is enough for me."

"[To Hitsugaya, after stabbing Hinamori] Aww...You found her. Sorry, I didn't want you to find out this way...No. I should have chopped her into little pieces and hidden them away where you would never find them."