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“He always reflects concerning the quality, and not the quantity, of his life. As soon as there are many events in his life that give him trouble and disturb his peace of mind, he sets himself free.”

“If the human race is to reach its peak of development one day, it will be in a natural environment with plant food. As cannibalism and artificial civilization corrupt him and drag him to the abyss of nothingness. Unless a humane race and a non-native whose life is governed by the laws of nature succeed him, otherwise his race will be shamefully extinguished.”

“The art of life is more like the wrestler's art than the dancer's, in respect of this, that it should stand ready and firm to meet onsets which are sudden and unexpected.”

“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."”

“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.”