Judge a man by his questions rather than by his answers.
Il est encore plus facile de juger de l'esprit d'un homme par ses questions que par ses réponses. (It is easier to judge the mind of a man by his questions rather than his answers) — Pierre-Marc-Gaston, duc de Lévis (1764-1830), Maximes et réflexions sur différents sujets de morale et de politique (Paris, 1808): Maxim xviii (
https://en.m.wikiquote.org/wiki/Voltaire)
My sustaining contribution to the Wikimedia Foundation pays off again. And 1808 was thirty years after Voltaire's death in 1778.
Years ago I resigned my editorship at Goodreads for their tolerance of unattributed and misattributed "quotations" <= scare-quotes! Now Goodreads is just an outlet for Amazon.