Liberty cannot be sacrificed for the sake of anything.

All the professors in all the religious colleges in this country rolled into one, would not equal Charles Darwin.

Ignorance worships mystery; reason explains it; the one grovels, the other soars.

All religions are inconsistent with mental freedom. Shakespeare is my bible, Burns my hymn-book.

The myth of hell represents all the meanness, all the revenge, all the selfishness, all the cruelty, all the hatred, all the infamy of which the heart of man is capable.

Anger is a wind which blows out the lamp of the mind.

At the bottom of religious persecution is the doctrine of self-defence; that is to say, the defence of the soul. If the founder of Christianity had plainly said: 'It is not necessary to believe in order to be saved; it is only necessary to do, and he who really loves his fellow-men, who is kind, honest, just and charitable, is to be forever blest' - if he had only said that, there would probably have been but little persecution.