Crossword Genius

"The origin of wisdom," per René Descartes (5)

Ross

I believe the answer is:

doubt

(Other definitions for doubt that I've seen before include "Feel uncertain about" , "Have reservations or be uncertain about" , "Misgiving" , "Don't be so sure!" , "Question the truth or accuracy of" .)

I've seen this clue in The New York Times.
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