There must ... be in our very nature a very radical and widespread tendency to observe beauty, and to value it. No account of the principles of the mind can be at all adequate that passes over so conspicuous a faculty.

Eternal vigilance is the price of knowledge.

There are three traps that strangle philosophy: The church, the marriage bed, and the professor's chair.

Manhood and sagacity ripen of themselves; it suffices not to repress or distort them.

The constant demands of the heart and the belly can allow man only an incidental indulgence in the pleasures of the eye and the understanding.

The need of exercise is a modern superstition, invented by people who ate too much and had nothing to think about.

The mediocrity of everything in the great world of today is simply appalling. We live in intellectual slums.