"If I have accomplished anything good, then it's mainly because I've been driven by the need to know whether I can accomplish things I'm not sure I have the capacity for."

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The key factor separating geniuses from the merely accomplished is not a divine spark. It's not I.Q., a generally bad predictor of success, even in realms like chess. Instead, it's deliberate practice. Top performers spend more hours (many more hours) rigorously practicing their craft.

— David Brooks