The by-product is sometimes more valuable than the product.

There can be no sexual love without lust; but, on the other hand, until the currents of lust in the organism have been irradiatedas to affect other parts of the psychic organism--at the least the affections and the social feelings--it is not yet sexual love. Lust, the specific sexual impulse, is indeed the primary and essential element in this synthesis, for it alone is adequate to the end of reproduction, not only in animals but in men. But it is not until lust is expanded and irradiated that it develops into the exquisite and enthralling flower of love.

It is only the great men who are truly obscene. If they had not dared to be obscene, they could never have dared to be great.

Thinking in its lower grades, is comparable to paper money, and in its higher forms it is a kind of poetry.

To make a mountain out of a mole-hill.

Life is livable because we know that wherever we go most of the people we meet will be restrained in their actions towards us by an almost instinctive network of taboos.

Reproduction is so primitive and fundamental a function of vital organisms that the mechanism by which it is assured is highly complex and not yet clearly understood. It is not necessarily connected with sex, nor is sex necessarily connected with reproduction.