"Of all things, good sense is the most fairly distributed: everyone thinks he is so well supplied with it that even th…"

"Car ce n'est pas assez d'avoir l'esprit bon, mais le principal est de l'appliquer bien."

"The first precept was never to accept a thing as true until I knew it as such without a single doubt."

"Divide each difficulty into as many parts as is feasible and necessary to resolve it."

"The last rule was to make enumerations so complete, and reviews so comprehensive, that I should be certain of omittin…"

"The long chains of simple and easy reasonings by means of which geometers are accustomed to reach the conclusions of …"

"Each problem that I solved became a rule, which served afterwards to solve other problems."

"On ne sauroit rien imaginer de si étranger et si peu croyable, qu’il n’ait été dit par quelqu’un des philosophes..."

"If we consider all external goods as equally beyond our power, we shall no more regret the absence of such goods... w…"

"Je pense, donc je suis."