Through the greatness of the universe, which philosophy contemplates, the mind also is rendered great, and becomes capable of that union with the universe which constitutes its highest good.

Americans need rest, but do not know it. I believe this to be a large part of the explanation of the crime wave in the United States.

Right conduct can never, except by some rare accident, be promoted by ignorance or hindered by knowledge.

Artists are on the average less happy than men of science.

Science, by itself cannot, supply us with an ethic.

Boredom is... a vital problem for the moralist, since half the sins of mankind are caused by the fear of it.

Hatred of enemies is easier and more intense than love of friends. But from men who are more anxious to injure opponents than to benefit the world at large no great good is to be expected.