"Good and evil increase at compound interest. That's why the little decisions we make every day are of infinite importance."

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Knowledge and productivity are like compound interest. The more you know, the more you learn; the more you learn, the more you can do; the more you can do, the more the opportunity. I don`t want to give you a rate, but it is a very high rate. Given two people with exactly the same ability, the one person who manages day in and day out to get in one more hour of thinking will be  tremendously more productive over a lifetime.

— Richard Hamming