It's obvious, but I must point out that giving the quote in the original French and providing a "rough translation" seems at odds with the message of the quote.
Why? I'm not an expert French->English translator, and I only invested a few minutes in the translation, so calling it "rough" seems appropriate. And saying something clearly in more than one language is more difficult than saying the same thing clearly in one language.
That a perfect, instant translation of a well-crafted quote by a talented French Enlightenment philosopher doesn't just roll off my fingertips in English shouldn't compromise the message.
A monthly thread for posting rationality-related quotes you've seen recently (or had stored in your quotesfile for ages).
ETA: It would seem that rationality quotes are no longer desired. After several days this thread stands voted into the negatives. Wolud whoever chose to to downvote this below 0 would care to express their disapproval of the regular quotes tradition more explicitly? Or perhaps they may like to browse around for some alternative posts that they could downvote instead of this one? Or, since we're in the business of quotation, they could "come on if they think they're hard enough!"