The conflict of forces and the struggle of opposing wills are of the essence of our universe and alone hold it together.

Failing to find in women exactly the same kind of sexual emotions, as they find in themselves, men have concluded that there are none there at all.

There is nothing more fragile than civilization.

The prevalence of suicide, without doubt, is a test of height in civilization; it means that the population is winding up its nervous and intellectual system to the utmost point of tension and that sometimes it snaps.

Every artist writes his own autobiography.

The parents have not only to train their children: it is of at least equal importance that they should train themselves.

The mathematician has reached the highest rung on the ladder of human thought.