If you are clever enough to figure out what men want, you are either too wise to marry them or too intimidating for them to marry you.

Christian theology is the grandmother of Bolshevism.

The question of whether world peace will ever be possible can only be answered by someone familiar with world history. To be familiar with world history means, however, to know human beings as they have been and always will be. There is a vast difference, which most people will never comprehend, between viewing future history as it will be and viewing it as one might like it to be. Peace is a desire, war is a fact; and history has never paid heed to human desires and ideals.

The mathematic, then, is an art. As such it has its styles and style periods. It is not, as the layman and the philosopher (who is in this matter a layman too) imagine, substantially unalterable, but subject like every art to unnoticed changes form epoch to epoch. The development of the great arts ought never to be treated without an (assuredly not unprofitable) side-glance at contemporary mathematics.

When the ordinary thought of a highly cultivated people begins to regard 'having children' as a question of pro's and con's, the great turning point has come.

It doesn't really matter what one writes into a constitution. The important thing is what the collective instinct eventually makes of it.

If few can stand a long war without deterioration of soul, none can stand a long peace.