Magister Templi (Master of the Temple) - whose functions are fully described in [The Vision and the Voice], as is this whole initiation from Adeptus Exemptus. See also “Aha!” His principal business is to tend his “garden” of disciples, and to obtain a perfect Understanding of the Universe. He is a Master of samādhi.

        The Grade of Master of the Temple is described in [The Vision and the Voice], as [below] indicated. There are full accounts in the Magical Diaries of the Beast 666, who was cast forth into the Heaven of Jupiter, and of Omnia in Uno, Unus in Omnibus [Charles Stansfeld Jones (Frater Achad)], who was cast forth into the sphere of the Elements.

        The essential Attainment is the perfect annihilation of that personality which limits and oppresses his true Self.

        The Magister Templi is pre-eminently the Master of Mysticism, that is, His Understanding is entirely free from internal contradiction or external obscurity; His Work is to comprehend the existing Universe in accordance with His own Mind. He is the Master of the Law of Sorrow (dukkhā).

        To attain the Grade of Magus he must accomplish Three Tasks; the renunciation of His enjoyment of the Infinite so that he may formulate Himself as the Finite; the acquisition of the practical secrets alike of initiating and governing His proposed new Universe; and the identification of Himself with the impersonal idea of Love.

Any Neophyte of the Order (or, as some say, any person soever) possesses the right to claim the Grade of Master of the Temple by taking the Oath of the Grade. It is hardly necessary to observe that to do so is the most sublime and awful responsibility which it is possible to assume, and an unworthy person who does so incurs the most terrific penalties by his presumption. (from "One Star in Sight")

The Oath of a Magister Templi
I, ______________________, a member of the Body of God, hereby bind myself on behalf of the Whole Universe, even as we are now physically bound unto the cross of suffering:

    that I will lead a pure life, as a devoted servant of the Order:
    that I will understand all things:
    that I will love all things:
    that I will perform all things and endure all things:
    that I will continue in the Knowledge and Conversation of my Holy Guardian Angel:
    that I will work without attachment:
    that I will work in truth:
    that I will rely only upon myself:
    that I will interpret every phenomenon as a particular dealing of God with my Soul.
    And if I fail herein, may my pyramid be profaned, and the Eye closed to me.
"Magister Templi gets a pyramid in the city of pyramids on the other side of the Abyss. This pyramid is consumed to ashes and stored in the Urn of a Magus. ... The ashes are preserved in the Urn of the Magus. The Magus must burn up his Karma." – The Vision and the Voice.