To refuse a hearing to an opinion, because they are sure that it is false, is to assume that their certainty is the same thing as absolute certainty. All silencing of discussion is an assumption of infallibility.

It is conceivable that religion may be morally useful without being intellectually sustainable.

The ne plus ultra of wickedness ... is embodied in what is commonly presented to mankind as the creed of Christianity.

There are many truths of which the full meaning cannot be realized until personal experience has brought it home.

All desirable things... are desirable either for the pleasure inherent in themselves, or as a means to the promotion of pleasure and the prevention of pain.

A people among whom there is no habit of spontaneous action for a collective interest - who look habitually to their government to command or prompt them in all matters of joint concern - who expect to have everything done for them, except what can be made an affair of mere habit and routine - have their faculties only half developed; their education is defective in one of its most important branches.

Photography is a brief complicity between foresight and luck.