The world's greatest thinkers have often been amateurs; for high thinking is the outcome of fine and independent living, and for that a professional chair offers no special opportunities.

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.

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

The mother is really a more immediate parent than the father because one is born from the mother, and the first experience of any infant is the mother.

The largely objective character of beauty is further indicated by the fact that to a considerable extent beauty is the expression of health. A well and harmoniously developed body, tense muscles, an elastic and finely toned skin, bright eyes, grace and animation of carriage- all these things which are essential to beauty are the conditions of health.

Still, whether we like it or not, the task of speeding up the decrease of the human population becomes increasingly urgent.

There is nothing more fragile than civilization.