"[about his deceased friend] I never overcame my shyness and told her that I actually liked clouds."

"[to Choe Neng Poww, as the giant Arrancar charges a Cero after making a comment on Komamura's strength] I see...Then I shall stop that yawn in its tracks. Bankai."

"That's right. It's not like I ever felt superior to anyone else because I could see ghosts. And I never planned to take it up as a profession. Hell, I never even felt the need to use my ability to help others. All I ever wanted was the normal life I couldn't have. I've finally achieved what I always wanted."

"[possessed by a Hollow] Why do you keep calling my name so? Are you that worried about me? Are you that much in love with me, little girl? If you love me so much...I'll eat you first!"

"Yhwach. You desired a world... Where fear would no longer be a burden. But... In a world without fear of death... People will never attain the hope that is to be found from casting their fears aside and preserving through them. While it is true that people can continue to press forward through the simple act of living... That is no way comparable to marching forward in the face of death, while doing their damndest to keep it at bay. That is why... That is why people have given that very march a unique and special name. "COURAGE.""

"I hate perfection. To be perfect is to be unable to improve any further."

"[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?"