Full Idea
You can tell whether a man is clever by his answers. You can tell whether a man is wise by his questions.
Gist of Idea
Tell cleverness from answers, but wisdom from questions
Source
Naguib Mahfouz (works [1998])
A Reaction
[Popped up on Twitter. I am adjusting to the 21st century] The observation is simplistic, of course, but very nice indeed.