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“In particular, while natural selection favors both males and females that leave many offspring, the best strategy for doing so may be different for fathers and mothers. That generates a built-in conflict between the parents, a conclusion that all too many humans don’t need scientists to reveal to them. We make jokes about the battle of the sexes, but the battle is neither a joke nor an aberrant accident of how individual fathers or mothers behave on particular occasions. It is indeed perfectly true that behavior that is in a male’s genetic interests may not necessarily be in the interests of his female co-parent, and vice versa. That cruel fact is one of the fundamental causes of human misery.”

“As we grow old, we become aware that death is drawing near; his shadow falls across our path; the realities of life seem less crude than of yore, they touch our senses less intimately, and they lose much of their poignancy.”

“Whatever is in any way beautiful hath its source of beauty in itself, and is complete in itself; praise forms no part of it. So it is none the worse nor the better for being praised.”

“Man must not only make himself: the weightiest thing he has to do is to determine what he is going to be. He is causa sui to the second power.”

“The ultimate form of intrinsic motivation is when a habit becomes part of your identity. It’s one thing to say I’m the type of person who wants this. It’s something very different to say I’m the type of person who is this.”