The benefit of astral travel is essentially one of education...it is akin to exploring one's own spiritual universe ("Every Magician possesses an Astral Universe peculiar to himself") and understanding the fundamental components, so that the adept can eventually master it. The general object is the "control of the Astral Plane, the ability to find one's way about it, to penetrate such sanctuaries as are guarded from the profane, to make such relations with its inhabitants as may avail to acquire knowledge and power, or to command service". Also, "one's apprehension of the Astral Plane must be accurate, for Angels, Archangels, and Gods are derived therefrom by analysis. One must have pure materials if one wishes to brew pure beer." It is vital to understand that all this must be in service to the Great Work of discovering one's True Will: