The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.

Let whoever can do so deceive me, he will never bring it about that I am nothing, so long as I continue to think I am something.

It's the familiar love-hate syndrome of seduction: "I don't really care what it is I say, I care only that you like it."

Nothing comes out of nothing.

An optimist may see a light where there is none, but why must the pessimist always run to blow it out?

At last I will devote myself sincerely and without reservation to the general demolition of my opinions.

If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.