"Isn't success ridiculously easy, once it begins to succeed? ... after the strain and sweat and pushing until the very groins of your being shrieked protest, something like momentum happened. It took your wits and your concentration and your continued willing sweat, of course, to keep it going, but the success of success had ball bearings."
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Source : Fannie Hurst (1959). “Imitation of Life”, New York : Permabooks