Not by accident, you may be sure, do the Christian Scriptures make the father of knowledge a serpent - slimy, sneaking and abominable.

The so-called religious organizations which now lead the war against the teaching of evolution are nothing more, at bottom, than conspiracies of the inferior man against his betters.

As for me, my literary theory, like my politics, is based chiefly upon one main idea, to wit, the idea of freedom. I am, in brief, a libertarian of the most extreme variety, and know of no human right that is one-tenth as valuable as the simple right to utter what seems (at the moment) to be the truth

The fact is that the average man's love of liberty is nine-tenths imaginary, exactly like his love of sense, justice and truth... Liberty is not a thing for the great masses of men. It is the exclusive possession of a small and disreputable minority, like knowledge, courage and honor. It takes a special sort of man to understand and enjoy liberty - and he is usually an outlaw in democratic societies.

Every autobiography ... becomes an absorbing work of fiction, with something of the charm of a cryptogram.

Jealousy is a keen observer, but looks for all the wrong signs.

The liberation of the human mind has never been furthered by dunderheads; it has been furthered by gay fellows who heaved dead cats into sanctuaries and then went roistering down the highways of the world, proving to all men that doubt, after all, was safe - that the god in the sanctuary was finite in his power and hence a fraud. One horse-laugh is worth ten thousand syllogisms. It is not only more effective; it is also vastly more intelligent.