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The great master key to riches is nothing more or less than the self-discipline necessary to help you take full and complete possession of your own mind.

Napoleon Hill
Keys, Self, Discipline
Napoleon Hill (2016). “The Master Key to Riches - A Sequel to Think and Grow Rich”, p.319, Lulu.com
The great master key to riches is nothing more or less than the self-discipline necessary to help you take full and complete possession of your own mind.