This principle can be traced way back to the beginning in Ancient Egypt with the writing of Thoth called the Hermetica, (The Emerald Tablet). We can trace this through history to present day by simply following the development of Christianity. Mosses had been raised as a prince of Egypt and being so learned all that was privilege to royalty, all the greatest wisdom and knowledge. This influenced Jewish mysticism a lot and was passed on to those that were worthy the closest disciples. Jesus was taught these great mysteries as a boy because the great magi recognized him and so he became very learned and extremely educated in the mysteries of the universe and thought. We see this today as taught by people that recognized it through Jesus but as well many others that found this truth one way or another. Great secret societies have kept the wisdom for the human race as they saw the importance of this, these came from (as I pointed out before) those worthy of the privilege of learning, so these started with royalty and then expanded to the wealthy and now is reaching the masses as many are ready for this now that were not before.

Proverbs 23:7 (Read all of Proverbs 23)

For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.

James Allen wrote an entire book on this called As A Man Thinketh. Here are some places you can get the book free. http://www.asamanthinketh.net/download.htm , http://www.conures.net/allen/allenhm.shtml , http://www.absolute1.net/think.html

But he is only one Florence Schovel Shinn wrote great books on using The Word to manifest, now that seems to have nothing to do with thinking, (after all who thinks of what they are saying right?) It has everything to do with the thinking she has some excellent books on the power of thought for manifesting, this could be not only for physical things but health as well.

Her books Florence Schovel Shinn are here http://www.conures.net/shinn/shinn.shtml , http://www.absolute1.net/free_self-help_books_online.html

Now there was Wallace Wattlesworth, Napoleon Hill, Emily Cady, Prentice Mulford, Ernst Holmes, Mary Baker Eddy, Charles Filmore, William Atkinson, Catherine Ponder, Robert Collier, and many more

all can be found here http://www.consciouslivingfoundation.org/ebooks-inspirational.htm#Word%20Documents

Through our history this secret has been well written of many times over, each time telling us that we have much more control over our experience of existence than we imagine our selves as having.

A huge book called A Course In Miracles that was channeled from Jesus gives very detailed info on this very subject and can be found here free. http://www.absolute1.net/free_self-help_books_online.html

For a big list of places to get similar books click here http://www.inwardquest.com/questions/5/where-can-i-find-free-reality-creation-books/2822#2822