Norman Vincent Peale: The first secret of success
People become really quite remarkable when they start thinking that they can do things. When they believe in themselves they have the first secret of success.
Dr. Norman Vincent Peale (May 31, 1898 - December 24, 1993) was a minister and author (most notably of The Power of Positive Thinking) and a progenitor of "positive thinking". His ideas were not accepted by mental health experts.