The man who does not do his own thinking is a slave, and is a traitor to himself and to his fellow-men.

There may or may not be a Supreme Ruler of the universe-but we are certain that man exists, and we believe that freedom is the condition of progress; that it is the sunshine of the mental and moral world, and that without it man will go back to the den of savagery, and wll become the fit associate of wild and ferocious beasts.

The hope of science is the perfection of the human race. The hope of theology is the salvation of a few, and the damnation of almost everybody.

How any human being ever has had the impudence to speak against the right to speak, is beyond the power of my imagination. Here is a man who speaks-who exercises a right that he, by his speech, denies. Can liberty go further than that? Is there any toleration possible beyond the liberty to speak against liberty-the real believer in free speech allowing others to speak against the right to speak?

Injustice upon earth renders the justice of of heaven impossible.

If all the historic books of the Bible were blotted from the memory of mankind, nothing of value would be lost.

No man of sense in the whole world believes in devils any more than he does in mermaids, vampires, gorgons, hydras, naiads, dryads, nymphs, fairies, the Fountain of Youth, [or] the Philosopher's Stone. . . .