Briefly, the book states that consciousness is the one and only reality, that consciousness is the cause and manifestation is the effect. It draws the reader’s attention to this fact constantly, that the reader may always keep first things first.
You will find that you are not a victim of fate but a victim of faith (your own).
Only through one door can that which you seek pass into the world of manifestation. “I AM the door”. Your consciousness is the door, so you must become conscious of being and having that which you desire to be and to have.