“If people lived forever—if they never got any older—if they could just go on living in this world, never dying, always healthy—do you think they’d bother to think hard about things, the way were doing now? I mean, we think about its everything, more or less—philosophy, psychology, logic. Religion. Literature. I kinda think, if there were no such thing as death, the complicated thoughts and ideas like that would never come into the world.”

“if people lived forever - if they never got any older - if they could just go on living in this world, never dying, always healthy - do you think they'd bother to think hard about things the way we're doing now? i mean, we thing about just about everything, more or less - philosophy, psychology, logic. religion. literature. i kinda think, if there were no such thing as death, that complicated thoughts and ideas like that would never come into the world......people have to think seriously about what it means for them to be alive here and now because they know they're going to die sometime. right? who would think about what it means to be alive if they were just going to go on living forever? why would they have to bother? or even if they should bother, they'd probably just figure, 'oh, well, i've got plenty of time for that. i'll think about it later.' but we can't wait till later. we've got to think about it right this second...nobody knows whats going to happen. so we need death to make us evolve...death is this huge, bright thing, and the bigger and brighter it is, the more we have to drive ourselves crazy thinking about things.”

“Memory is a funny thing. When I was in the scene, I hardly paid it any mind. I never stopped to think of it as something that would make a lasting impression, certainly never imagined that eighteen years later I would recall it in such detail. I didn't give a damn about the scenery that day. I was thinking about myself. I was thinking about the beautiful girl walking next to me. I was thinking about the two of us together, and then about myself again. It was the age, that time of life when every sight, every feeling, every thought came back, like a boomerang, to me. And worse, I was in love. Love with complications. The scenery was the last thing on my mind.”

“I’ve never once thought about how I was going to die,” she said. “I can’t think about it. I don’t even know how I’m going to live.”

“You have to make an effort to always look at the good side, always think about the good things. Then you've got nothing to be afraid of. If something bad comes up, you do more thinking at that point.”

“Everybody's gotta die sometime. But until then we've still got fifty-some odd years to go, and a lot to think about while we're living those fifty years, and I'll just come right out and say it: that's even more tiring than living five thousand years thinking about nothing. Don't you think?”

“Walking to the subway, Aomame kept thinking about the strangeness of the world. If, as the dowager had said, we were nothing but gene carriers, why do so many of us have to lead such strangely shaped lives? Wouldn’t our genetic purpose – to transmit DNA – be served just as well if we lived simple lives, not bothering our heads with a lot of extraneous thoughts, devoted entirely to preserving life and procreating? Did it benefit the genes in any way for us to lead such intricately warped, even bizarre, lives?… how could it possibly profit the genes to have such people existing in this world? Did the genes merely enjoy such deformed episodes as colorful entertainment, or were these episodes utilized by them for some greater purpose?”