"If it's not enough to believe in justice, then I will become justice. I will seek out all evil in this world and wipe them out like the clouds in the sky. I swear I will...For justice."

"If there is such a thing like happiness in this world, it should resemble the endless nothingness. Nihility is having nothing and having nothing to lose. If that isn't happiness... then what is?"

"[to Karin] Do as your heart desires! Jump into your father's bosom!"

"Admiration is a feeling furthest away from understanding."

"Training hard, risking your life... what's the difference?"

"[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?"

"Though you fight a fierce battle on the outside, your inner world trembles not the slightest."