Christianity has made more lunatics than it ever provided asylums for.

Our civilization is not Christian. It does not come from the skies. It is not a result of inspiration. It is the child of invention, of discovery, of applied knowledge - that is to say, of science. When man becomes great and grand enough to admit that all have equal rights; when thought is untrammeled; when worship shall consist in doing useful things; when religion means the discharge of obligations to our fellow-men, then, and not until then, will the world be civilized.

The closer I'm bound in love to you, the closer I am to free.

Take the word Liberty from human speech and all the other words become poor, withered, meaningless sounds - but with that word realized - with that word understood, the world becomes a paradise.

This crime called blasphemy was invented by priests for the purpose of defending doctrines not able to take care of themselves.

There are some truths, however, that we should never forget: Superstition has always been the relentless enemy of science; faith has been a hater of demonstration; hypocrisy has been sincere only in its dread of truth, and all religions are inconsistent with mental freedom.

I would rather live with the woman I love in a world full of trouble, than to live in heaven with nobody but men.