Earl Nightingale (March 12, 1921 – March 28, 1989) was an Americanmotivational speaker and author, known as the "Dean of Personal Development." He was the voice in the early 1950s of Sky King, the hero of a radio adventure series, and was a WGN radio show host from 1950 to 1956. Nightingale was the author of the Strangest Secret, which economist Terry Savage has called “…One of the great motivational books of all time“. From Wikipedia,
The Strangest Secret in the World. Called "one of the great motivational books of all time," Earl Nightingale was inspired to write the book after reading Napoleon Hill's Think and Grow Rich.
It came when he realized that the six words he read were the answer to the question he had been looking for! That, "we become what we think about". He he realized that he had been reading the same truth over and over again, from the New Testament, in the sayings of Buddha, in the writings of Lao Tse, to the works of Emerson. "We become what we think about." "As ye sow, so shall ye reap."