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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.”

“A man can die but once.”

“From Apollonius, true liberty, and unvariable steadfastness, and not to regard anything at all, though never so little, but right and reason: and always..that it was possible for the same man to be both vehement and remiss: a man not subject to be vexed, and offended with the incapacity of his scholars and auditors in his lectures and expositions.”

“In countries where there is a mild climate, less effort is expended on the struggle with nature and man is kinder and more gentle.”

“The measure of a person's disposition is this: ... how great is the distance between his understanding and his actions. Basically we all understand the highest. A child, the simplest person, and the wisest all understand the highest. ... But what makes the difference is whether we understand it at a distance—so that we do not act accordingly, or close at hand—so that we act accordingly and "cannot do otherwise."”