If you want me to believe in God, you must make me touch him.

What is this world? A complex whole, subject to endless revolutions. All these revolutions show a continual tendency to destruction; a swift succession of beings who follow one another, press forward, and vanish; a fleeting symmetry; the order of a moment. I reproached you just now with estimating the perfection of things by your own capacity; and I might accuse you here of measuring its duration by the length of your own days.

Scepticism is the first step toward truth.

Philosophy is as far separated from impiety as religion is from fanaticism.

The bad gives rise to the good, the good inspires the better, the better produces the excellent, the excellent is followed by the bizarre

How old the world is! I walk between two eternities.... What is my fleeting existence in comparison with that decaying rock, that valley digging its channel ever deeper, that forest that is tottering and those great masses above my head about to fall? I see the marble of tombs crumbling into dust; and yet I don't want to die!

For me, my thoughts are my prostitutes.