I consider this affirmation of great importance and I recommend repeating it before your astral projection practice, and even during the day if you have a quite moment. I wrote it down on a piece of paper years ago and still carry it round with me today. You can see it below.
Below is an video of Robert Monroe repeating his affirmation.
“I am more than my physical body. Because I am more than physical matter, I can perceive that which is greater than the physical world.
Therefore, I deeply desire to expand, to experience, to know, to understand, to control, to use such greater energies and energy systems as may be beneficial and constructive to me and to those who follow me.
Also, I deeply desire the help and cooperation, the assistance, the understanding of those individuals whose wisdom, development and experience are equal to or greater than my own.
I ask their guidance and protection from any influence or any source that might provide me with less than my stated desires.“