If you want to be a real seeker of truth, you need to, at least once in your lifetime, doubt in, as much as it's possible, in everything.

True eloquence makes light of eloquence. True morality makes light of morality.

From whence comes it that a cripple in body does not irritate us, and that a crippled mind enrages us? It is because a cripple sees that we go right, and a distorted mind says that it is we who go astray. But for that we should have more pity and less rage.

Reverend Fathers, my letters did not usually follow each other at such close intervals, nor were they so long.... This one would not be so long had I but the leisure to make it shorter.

The last function of reason is to recognize that there are an infinity of things which surpass it.

Most of man's trouble comes from his inability to be still.

All this visible world is but an imperceptible point in the ample bosom of nature.