Denis Diderot

Oh! how near are genius and madness! Men imprison them and chain them, or raise statues to them.

Fanaticism is just one step away from barbarism.

What has not been examined impartially has not been well examined. Skepticism is therefore the first step toward truth.

Niczego równie trudno nie przebacza się komuś, co jego zalet.

Lepiej zużywać się niż rdzewieć.

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.