I am paid by the word, so I always write the shortest words possible.

The main thing needed to make men happy is intelligence.

Throughout the long period of religious doubt, I had been rendered very unhappy by the gradual loss of belief, but when the process was completed, I found to my surprise that I was quite glad to be done with the whole subject.

It is not what the man of science believes that distinguishes him, but how and why he believes it. His beliefs are tentative, not dogmatic; they are based on evidence, not on authority or intuition.

The man who pursues happiness wisely will aim at the possession of a number of subsidiary interests in addition to those central ones upon which his life is built.

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.

There is in Aristotle an almost complete absence of what may be called benevolence or philanthropy. The sufferings of mankind . . . there is no evidence that they cause him unhappiness except when the sufferers happen to be his friends.