“You may be hurt if you love too much, but you will live in misery if you love too little.”
Source: Napoleon Hill's Positive Action Plan: 365 Meditations For Making Each Day a Success
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Napoleon Hill 104
American author 1883–1970Related quotes

Rolling Stone video interview of The Dead Weather (beginning at 1:50) "The Dead Weather Muse on the Future of Music, Supergroup War" https://www.youtube.com/watch?v=Llw9S1hMZ4s, Rolling Stone, April 17, 2010. Retrieved on January 5, 2015.
2010

Source: The Diary of Anaïs Nin, Vol. 1: 1931-1934
You and Your Research (1986)
Context: Most people like to believe something is or is not true. Great scientists tolerate ambiguity very well. They believe the theory enough to go ahead; they doubt it enough to notice the errors and faults so they can step forward and create the new replacement theory. If you believe too much you'll never notice the flaws; if you doubt too much you won't get started. It requires a lovely balance.
“You may be deceived if you trust too much, but you will live in torment if you do not trust enough”
As quoted in Business Education World, Vol. 15 (1935) p. 172.