When shall we see poets born? After a time of disasters and great misfortunes, when harrowed nations begin to breathe again. And then, shaken by the terror of such spectacles, imaginations will paint things entirely strange to those who have not witnessed them.

A thing is not proved because no one has ever questioned it... Skepticism is the first step toward truth.

Time, matter, space - all, it may be, are no more than a point.

There is only one virtue, justice; only one duty, to be happy; only one corollary, not to overvalue life and not to fear death.

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

Only the bad man is alone.

I have only a small flickering light to guide me in the darkness of a thick forest. Up comes a theologian and blows it out.