The monster, fanaticism, still exists, and whoever seeks after truth will run the risk of being persecuted.

The mirror is a worthless invention. The only way to truly see yourself is in the reflection of someone else's eyes.

Man is free the moment he wants to be.

Let us meet four times a year in a grand temple with music, and thank God for all his gifts. There is one sun. There is one God. Let us have one religion. Then all mankind will be brethren.

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 ancients recommended us to sacrifice to the Graces, but Milton sacrificed to the Devil.

What is tolerance? It is the consequence of humanity. We are all formed of frailty and error; let us pardon reciprocally each other's folly - that is the first law of nature.