Crossword Genius

"Enthusiasm is the mother of ___": Ralph Waldo Emerson (6)

Ross

I believe the answer is:

effort

(Other definitions for effort that I've seen before include "Try - labour - pains" , "Energy exerted to achieve something" , "Toil" , "For eft (anag.)" , "force?" .)

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