It is those who concentrates on but one thing at a time who advance in this world. The great man or woman is the one who never steps outside his or her specialty or foolishly dissipates his or her individuality.

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.