After college he became a traveling salesman, tried being an actor and failed. He succeeded in being a cheerleader of sorts for the depressed worker. By then hundreds of thousands signed up to hear him speak. To date he has sold 30 million copies of his book and is published in 80 different languages in 80 different countries.
The man who is enthusiastic will find the scales tipped in his favor.
And a man of second-rate ability, with enthusiasm, will outstrip a man of first-rate ability without enthusiasm.