We have just enough religion to make us hate, but not enough to make us love one another.

One religion is as true as another.

To doubt everything or to believe everything are two equally convenient solutions; both dispense with the need for thought.

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.

Religion! How it dominates man’s mind, how it humiliates and degrades his soul. God is everything, man is nothing, says religion. But out of that nothing God has created a kingdom so despotic, so tyrannical, so cruel, so terribly exacting that naught but gloom and tears and blood have ruled the world since gods began.

Whatsoever is, is in God.

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

Reason and experience both forbid us to expect that national morality can prevail in exclusion of religious principle.

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

God is a concept by which we measure our pain.

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.

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.

If God did not exist, it would be necessary to invent him.