If faces were not alike, we could not distinguish men from beasts; if they were not different, we could not tell one man from another.

Philosophical discussions habitually make men happy and joyful not frowning and sad.

My life has been full of terrible misfortunes most of which never happened.

Obstinacy and dogmatism are the surest signs of stupidity. Is there anything more confident, resolute, disdainful, grave and serious than an ass?

If not for that of conscience, yet at least for ambition's sake, let us reject ambition, let us disdain that thirst of honor and renown, so low and mendicant; that it makes us beg it of all sorts of people.

Que sçais-je?" (What do I know?)

I never met a man who thought his thinking was faulty.