A free (legal) audiobook version can be found here:<p><a href="http://www.learnoutloud.com/Free-Audio-Video/Self-Development/Mind-and-Body/As-a-Man-Thinketh/15183" rel="nofollow">http://www.learnoutloud.com/Free-Audio-Video/Self-Developmen...</a>
I'm somewhat put off by the similarity of the ideas in this book to the ridiculous "The Secret" with its "Law of Attraction." I found this out through reviews of the book though, and the similarity may well be superficial.
There are many many free and legal books available, so it's not especially interesting to point to just one. What's interesting is to know which of them are worth reading (and, preferably, why).