If a Black Death could be spread throughout the world once in every generation survivors could procreate freely without making the world too full.

What men really want is not knowledge but certainty.

It seems to be the fate of idealists to obtain what they have struggled for in a form which destroys their ideals.

Each act of cruelty is eternally a part of the universe; nothing that happens later can make that act good rather than bad, or can confer perfection on the whole of which it is a part.

Morality in sexual relations, when it is free from superstition, consists essentially in respect for the other person, and unwillingness to use that person solely as a means of personal gratification, without regard to his or her desires.

The experience of overcoming fear is extraordinarily delightful.

And all this madness, all this rage, all this flaming death of our civilization and our hopes, has been brought about because a set of official gentlemen, living luxurious lives, mostly stupid, and all without imagination or heart, have chosen that it should occur rather than that any one of them should suffer some infinitesimal rebuff to his country`s pride.