Belief is desecrated when given to unproved and unquestioned statements for the solace and private pleasure of the believer . . . It is wrong always, everywhere, and for every one, to believe anything upon insufficient evidence.

Of course, this has its good side as well as its bad one. As we become permanent drunkards by so may separate drinks, so we become saints in the moral, and authorities and experts in the practical and scientific spheres, by so many separate acts and hours of work. Let no youth have any anxiety about the upshot of his education, whatever the line of it may be. If he keep faithfully busy each hour of the working day, he may safely leave the final result to itself.

Impulse without reason is enough, and reason without impulse is a poor makeshift.

To be a real philosopher all that is necessary is to hate some one else's type of thinking.

An impression which simply flows in at the pupil's eyes or ears and in no way modifies his active life, is an impression gone to waste. It is physiologically incomplete... Its motor consequences are what clinch it.

First... a new theory is attacked as absurd; then it is admitted to be true, but obvious and insignificant; finally it is seen to be so important that its adversaries claim that they themselves discovered it.

Truth lives, in fact, for the most part on a credit system