I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.

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

The most dangerous madmen are those created by religion, and people whose aim is to disrupt society always know how to make good use of them.

God is a concept by which we measure our pain.

An irreligious man is not one who denies the gods of the majority, but one who applies to the gods the opinions of the majority. For what most men say about the gods are not ideas derived from sensation, but false opinions, according to which the greatest evils come to the wicked, and the greatest blessings come to the good from the gods.

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

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

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

Among all nations, through the darkest polytheism glimmer some faint sparks of monotheism.

God is a complex of ideas formed by the tribe, the nation, and humanity, which awake and organize social feelings and aim to link the individual to society and to bridle the zoological individualism.

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.

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.