While I do not want to get into this particular sparring match between MJ and JS about whether TM is a devotional practice or not, the following link points to a few pages of Maharishi's Theory of Spiritual development from 1955, which is the earliest document I know of that describes his system of meditation.
This is a PDF document, an excerpt from 'Beacon Light of the Himalayas'. Because the TMO did not exist then, and this was published without a copyright, I will assume it is in the public domain. http://bit.ly/YQmNKW
