Il est dans la nature humaine de penser sagement et d'agir d'une façon absurde.
English translation: It is human nature to think wisely and to act in an absurd fashion.
Anatole France, Le livre de mon ami (1885)
I love how English/French translations have so many cognates! (You could even up that one a little more by using "sagely" instead of "wisely".)
Here's the new thread for posting quotes, with the usual rules: