Positive mental attitude (PMA) is a concept first introduced in 1937 by Napoleon Hill in the book Think and Grow Rich. The book never actually uses the term, but discusses the importance of positive thinking as a contributing factor of success.
Positive mental attitude (PMA) is a concept first introduced in 1937 by Napoleon Hill in the book Think and Grow Rich. The book never actually uses the term, but discusses the importance of positive thinking as a contributing factor of success.
Source: Wikipedia "Positive mental attitude" · CC BY-SA 4.0
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