For every fresh stage in our lives we need a fresh education, and there is no stage for which so little educational preparation is made as that which follows the reproductive period.

The place where optimism most flourishes is the lunatic asylum.

There is nothing more fragile than civilization.

There is a very intimate connection between hypnotic phenomena and religion.

To live remains an art which everyone must learn, and which no one can teach.

Men who know themselves are no longer fools. They stand on the threshold of the door of Wisdom.

There is held to be no surer test of civilization than the increase per head of the consumption of alcohol and tobacco. Yet alcohol and tobacco are recognizable poisons, so that their consumption has only to be carried far enough to destroy civilization altogether.