I do not think any reasonable person can doubt that in India, China and Japan, if the knowledge of birth control existed, the birthrate would fall very rapidly

I should like to believe my people's religion, which was just what I could wish, but alas, it is impossible. I have really no religion, for my God, being a spirit shown merely by reason to exist, his properties utterly unknown, is no help to my life. I have nor the parson's comfortable doctrine that every good action has its reward, and every sin is forgiven. My whole religion is this: do every duty, and expect no reward for it, either here or hereafter.

The man who is unhappy will, as a rule, adopt an unhappy creed, while the man who is happy will adopt a happy creed; each may attribute his happiness or unhappiness to his beliefs, while the real causation is the other way round.

It is not my prayer and humility that you cause things to go as you wish, but by acquiring a knowledge of natural laws.

It is permissible with certain precautions to speak in print of coitus, but it is not permissible to employ the monosyllabic synonym for this word.

Your writing is never as good as you hoped; but never as bad as you feared.

It has been said that man is a rational animal. All my life I have been searching for evidence which could support this.