Questions show the mind’s range, and answers, its subtlety.
 
[Les questions montrent l’étendue de l’esprit, et les réponses sa finesse.]

Joseph Joubert (1754-1824) French moralist, philosopher, essayist, poet
Pensées [Thoughts], ch. 4 “De la Nature des Esprits [On the Nature of Minds],” ¶ 62 (1850 ed.) [tr. Lyttelton (1899), ch. 3, ¶ 21]
    (Source)

(Source (French))

While confirmed as an entry in the French, I was unable to find translations other than Lyttelton's in my various sources.