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Napoleon Hill: When you deliver the best service of which you are capable, striving each time…

When you deliver the best service of which you are capable, striving each time to excel all your previous efforts, you are making use of the highest form of education.
Napoleon HillSourced
Source
From the book The Law of Success in Sixteen Lessons, Lesson Nine, "Habit of Doing More Than Paid for"; Ralston University Press, 1928

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