In Napoleon Hill's best selling book, "Think and Grow Rich" he repeatedly literally mentions "the secret," which is directly related to the concepts of the hit DVD and book called "The Secret," by Rhonda Byrnes, featured on Oprah in February 2007.  For those who are not as interested in the spiritual aspects of "The Secret," "Think and Grow Rich" depicts a more practical approach to accomplishing the same things, using similar methods.  An excellent book to read and re-read, or listen to on CD.