The taboo against nakedness is an obstacle to a decent attitude on the subject of sex.

As for earthquakes, though they were still formidable, they were so interesting that men of science could hardly regret them.

The secret of happiness is this: let your interests be as wide as possible, and let your reactions to the things and persons that interest you be as far as possible friendly rather than hostile.

Have no respect for the authority of others, for there are always contrary authorities to be found

No man treats a motorcar as foolishly as he treats another human being. When the car will not go, he does not attribute its annoying behavior to sin; he does not say, 'You are a wicked motorcar, and I shall not give you any more petrol until you go.' He attempts to find out what is wrong and to set it right.

Be isolated, be ignored, be attacked, be in doubt, be frightened, but do not be silenced.

Moral progress has consisted in the main of protest against cruel customs, and of attempts to enlarge human sympathy.