Unknown and Unknowable is the Supreme Mystery-God. It is the Voice of the Ineffable Name and the Wisdom of the Initiates (Epopteia). It is the Holy of Holies, the Unity of Unities, more ineffable than all Silence, more occult than all Essence. It is Plato’s Unspeakable All, He whom no person has seen, except the Son. It is Pythagoras’ Ineffable God’s Name, and key to the mysteries of the Kabbalah. It is the Holy Word of God that “no man knew but He himself.” The Name is Ineffable because non-existent. It permeates the Moon and Stars, yet It is different from the Moon and Stars. It never differentiates but only emanates. There is no need travelling to distant places to find It. The Name is very nigh unto thee, in thy mouth, and in thy heart. It may rush into infinite worlds in sleepless whirling, yet It remains latent in the deepest recesses of thy heart. The Ineffable Name is Deity Itself, but not God. Nameless, unpronounceable, yet universally diffused Essence, the Ineffable is Kama-Eros-Phanes or noumenon of Fohat, i.e., Divine Will or Eternal Desire of manifesting Itself through visible creation. The Name lies hidden within the Pythagorean Tetrad or Tetractys. It is expressed by the Tau Cross, signet of the Living God. The double motion of the philosophical cross is the great arcanum of life and being. Deity is Nameless, Numberless, No-thing, Absolute Darkness. God is quaternary: Ineffable–Silence–Father–Truth. All powers and great symphonies of physical and spiritual nature lie inscribed within the Perfect Square. That is why the Ineffable Name was replaced by the Sacred Tetrad or Tetractys, the most binding and solemn oath with the ancient mystics. There are three Tetrads: the Unfathomable Father (First Logos), Its creative emanation or Heavenly Man (Second Logos), and the embodied reflection of the latter in humanity at large (Third Logos), or the Tetragrammaton of the Jews. Only the first is the real, Pythagorean Tetractys; the other two are counterfeit. The Ineffable Word is identical with the “Ineffable Name” of the Masons and the Kabbalists. The Word itself is only a substitute for the Masonic “Lost Word,” and a comparatively modern invention. The “Lost Word” is no word at all, as in the case of the “Ineffable Name.” It ought to stand as “lost words” and lost secrets, in general. Nor the “Name” is a name, but Sound or rather Motion. The “Name” is not “ineffable,” it is “unpronounceable” or rather not to be pronounced.