The man visited by ecstasies and visions, who takes dreams for realities is an enthusiast; the man who supports his madness with murder is a fanatic.

I am the best-natured creature in the world, and yet I have already killed three, and of these three two were priests.

If mankind were born tomorrow it would divide into groups; each would scramble to invent their one and only god, and set about butchering each-other.

As you know, the Inquisition is an admirable and wholly Christian invention to make the pope and the monks more powerful and turn a whole kingdom into hypocrites.

We are intelligent beings: intelligent beings cannot have been formed by a crude, blind, insensible being: there is certainly some difference between the ideas of Newton and the dung of a mule. Newton's intelligence, therefore, came from another intelligence

The question of good and evil remains in irremediable chaos for those who seek to fathom it in reality. It is mere mental sport to the disputants, who are captives that play with their chains.

Man is free at the instant he wants to be.