Obstacles are necessary for success because in selling, as in all careers of importance, victory comes only after many struggles and countless defeats.

Mandino kept a personalized 8 X 10 photograph of Stewart. Work is not your enemy but your friend. html ("The Greatest Success in the World" page 11 http://www.

He wrote the bestselling book The Greatest Salesman in the World. He was the president of Success Unlimited magazine until 1976 and is an inductee of the National Speakers Association's Hall of Fame. Augustine "Og" Mandino II (December 12 1923 – September 3 1996) was an American author.