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.

The perfect is the enemy of the good.

It is not enough to be exceptionally mad, licentious and fanatical in order to win a great reputation; it is still necessary to arrive on the scene at the right time.

What a heavy burden is a name that has become too famous.

Superstition is to religion what astrology is to astronomy the mad daughter of a wise mother. These daughters have too long dominated the earth.

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

To the wicked, everything serves as pretext.