Men habitually use only a small part of the power which they actually possess.

Better risk loss of truth than chance of error--that is your faith-vetoer's exact position. He is actively playing his stake as much as the believer is; he is backing the field against the religious hypothesis, just as the believer is backing the religious hypothesis against the field.

One hears of the mechanical equivalent of heat. What we now need to discover in the social realm is the moral equivalent of war: something heroic that will speak to men as universally as war does, and yet will be as compatible with their spiritual selves as war has proved itself to be incompatible.

The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.

Most people live, whether physically, intellectually or morally, in a very restricted circle of their potential being.

Every time a resolve or a fine glow of feeling evaporates without bearing practical fruit is worse than a chance lost; it works to hinder future resolutions and emotions from taking the normal path of discharge. There is no more contemptible type of human character than that of the nerveless sentimentalist and dreamer, who spends his life in a weltering sea of sensibility and emotion, but who never does a manly concrete deed.

True ideas are those that we can assimilate, validate, corroborate, and verify. False ideas are those that we cannot. That is the practical difference it makes to us to have true ideas; that therefore is the meaning of truth, for it is all that truth is known as.