To announce truths is an infallible receipt for being persecuted.

And ask each passenger to tell his story, and if there is one of them all who has not cursed his existence many times, and said to himself over and over again that he was the most miserable of men, I give you permission to throw me head-first into the sea.

I am convinced that everything has come down to us from the banks of the Ganges, astronomy, astrology, metempsychosis, etc. It does not behoove us, who were only savages and barbarians when these Indians and Chinese peoples were civilized and learned, to dispute their antiquity.

To believe in God is impossible not to believe in Him is absurd.

The system of Descartes... seemed to give a plausible reason for all those phenomena; and this reason seemed more just, as it is simple and intelligible to all capacities. But in philosophy, a student ought to doubt of the things he fancies he understands too easily, as much as of those he does not understand.

They are mad men (Jews), but you should not burn them for that.

I keep to old books, for they teach me something; from the new I learn very little