"A man has cause for ___ only when he sows and no one reaps": Charles Goodyear

I believe the answer is:

regret

(Other definitions for regret that I've seen before include "Be sorry for, wish it hadn't happened" , "Mourn" , "Feel sorry about" , "Be contrite about" , "Subsidiary theorem" .)

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

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