It is a waste of energy to be angry with a man who behaves badly, just as it is to be angry with a car that won't go.

[There has been] every kind of cruelty practiced upon all sorts of people in the name of religion.

The fundamental concept in social science is Power, in the same sense in which Energy is the fundamental concept in physics.

Who ever heard a theologian preface his creed, or a politician conclude his speech with an estimate of the probable error of his opinion?

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.

America... where law and custom alike are based upon the dreams of spinsters...

My whole religion is this: do every duty, and expect no reward for it, either here or hereafter.