God is a concept by which we measure our pain.

I believe in an America where the separation of church and state is absolute, where no Catholic prelate would tell the president (should he be a Catholic) how to act and no Protestant minister would tell his parishioners for whom to vote.

Religion is by no means a proper subject of conversation in mixed company.

Whatsoever is, is in God.

The various modes of religion which prevailed in the Roman world were all considered by the people as equally true, by the philosophers equally false, and by the magistrate as equally useful.

God is really only another artist. He invented the giraffe, the elephant, and the cat. He has no real style. He just goes on trying other things.

One religion is as true as another.

The Church says that the earth is flat, but I know that it is round, for I have seen the shadow on the moon, and I have more faith in the shadow than in the Church.

So long as one believes in God, one has the right to do the Good in order to be moral.

Without doubt God is the universal moving force, but each being is moved according to the nature that God has given it. He directs angels, man, animals, brute matter, in sum all created things—but each according to its nature—and man having been created free, he is freely led. This rule is truly the eternal law and in it we must believe.

The freedom or immunity from coercion in matters religious, which is the endowment of persons as individuals, is also to be recognized as their right when they act in community. Religious communities are a requirement of the social nature both of man and of religion itself.

Educate people without religion and you make them but clever devils.

The nature of God is a circle, of which the center is everywhere and the circumference is nowhere.