The philosopher forms his principles on an infinity of particular observations. He does not confuse truth with plausibility, he takes for truth what is true, for false what is false, for doubtful what is doubtful, and probable what is probable. The philosophical spirit is thus a spirit of observation and accuracy.

The world is the house of the strong.

No man has received from nature the right to give orders to others. Freedom is a gift from heaven, and every individual of the same species has the right to enjoy it as soon as he is in enjoyment of his reason.

Passions destroy more prejudices than philosophy does.

If there were a reason for preferring the Christian religion to natural religion, it would be because the former offers us, on the nature of God and man, enlightenment that the latter lacks. Now, this is not at all the case; for Christianity, instead of clarifying, gives rise to an infinite multitude of obscurities and difficulties.

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 on occasion.

There is not a Musselman alive who would not imagine that he was performing an action pleasing to God and his Holy Prophet by exterminating every Christian on earth, while the Christians are scarcely more tolerant on their side.