Too much doubt is better than too much credulity.

If I owe Smith ten dollars and God forgives me, that doesn't pay Smith.

Would God give a bird wings and make it a crime to fly? Would he give me brains and make it a crime to think? Any God that would damn one of his children for the expression of his honest thought wouldn't make a decent thief. When I read a book and don't believe it, I ought to say so. I will do so and take the consequences like a man.

Blasphemy is what an old dogma screams at a new truth.

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

Darwin has done more to change human thought than all the priests who have existed.

Every pulpit is a pillory, in which stands a hired culprit, defending the justice of his own imprisonment.