Samael Aun Weor wrote this book to instruct those who have completed the first four Initiations of Major Mysteries and are ready to begin the fifth, the creation of the Causal Body.
Through the first four initiations, the initiate raised the kundalini in the physical body, vital body, astral body, and mental body, making the Innermost a Buddha. Now, with the fifth serpent of fire, the will of the Human Soul (Tiphereth) must reflect the will of the Father (Chesed).
Christ's Will (1959) by Samael Aun Weor has not yet been published, but it can be if you help: make a donation.
"...in this day and age, it is very dangerous to just simply follow someone. What is best is to seek the Inner Master."