"The Apocalypse the book of the Gnosis or Secret Doctrine of the first Christians"
"The triad, being the fundamental principle of the whole Kabalah or Sacred Tradition of our fathers, was necessarily the fundamental dogma of Christianity; the apparent dualism of which it explains by the intervention of a harmonious and all-powerful unity. Christ did not put His teaching into writing, and only revealed it in secret to His favored disciple, the one Kabalist, and he a great Kabalist, among the apostles.
So is the Apocalypse the book of the Gnosis or Secret Doctrine of the first Christians, and the key of this doctrine is indicated by an occult versicle of the Lord's Prayer, which the Vulgate leaves untranslated, while in the Greek Rite, the priests only are permitted to pronounce it. This versicle, completely kabalistic, is found in the Greek text of the Gospel according to St Matthew, and in several Hebrew copies, as follows:
The sacred word MALKUTH substituted for KETHER, which is its kabalistic correspondent, and the equipoise of GEBURAH and CHESED, repeating itself in the circles of heavens called eons by the Gnostics, provided the keystone of the whole Christian Temple in the occult versicle. It has been retained by Protestants in their New Testament, but they have failed to discern its lofty and wonderful meaning, which would have unveiled to them all the Mysteries of the Apocalypse. There is, however, a tradition in the Church that the manifestation of these mysteries is reserved till the last times.”
Excerpt from Éliphas Lévi's, "Transcendental Magic: Its Doctrine and Ritual."