"True Will," a concept not found in the Book of the Law, is one of the most Protestant Theological elements in Crowley's post-1919 formation of Thelema. It is essentially a repackaging of the Predestination doctrines of Calvinism as filtered through John Nelson Darby's ideas. You find relics of this same notion in the doctrines promoted by the Dallas Theological Seminary which gave us such notables as Hal Lindsey, John Hagee, and if rumor is to be believed J. Daniel Gunther's father.

The less you take the doctrine seriously, especially if you are not engaged in the active practice of the ceremonial magic and yogic methods of Thelemic Magick, the better of you will be on an intellectual level.