“Symbols of divine truth were not invented for the amusement of the ignorant;
they are the alpha and omega of philosophic thought.”—H.P.B.
The Sephirothal Tree
With the Hebrew kabalists, En-Soph is non-existent איןסוף, for it is incomprehensible to our finite intellects, and therefore cannot exist to our minds. Its first emanation was Sephira, the crown כתר. When the time for an active period had come, then was produced a natural expansion of this Divine essence from within outwardly, obedient to eternal and immutable law; and from this eternal and infinite light (which to us is darkness) was emitted a spiritual substance. This was the First Sephiroth, containing in herself the other nine ספירות Sephiroth, or intelligences. In their totality and unity they represent the archetypal man, Adam Kadmon, the πρωτόγονος, who in his individuality or unity is yet dual, or bisexual, the Greek Didumos, for he is the prototype of all humanity. Thus we obtain three trinities, each contained in a “head.” In the first head, or face (the three-faced Hindu Trimurti), we find Sephira, the first androgyne, at the apex of the upper triangle, emitting Hackama, or Wisdom, a masculine and active potency—also called Jah, יה—and Binah, בינה, or Intelligence, a female and passive potency, also represented by the name Jehovah יהוה. These three form the first trinity or “face” of the Sephiroth. This triad emanated Hesed, חסד, or Mercy, a masculine active potency, also called El, from which emanated Geburah, [גבורה], or Justice, also called Eloha, a feminine passive potency; from the union of these two was produced Tiphereth תפרת, Beauty, Clemency, the Spiritual Sun, known by the divine name Elohim; and the second triad, “face,” or “head,” was formed. These emanating, in their turn, the masculine potency Netzah, נצח, Firmness, or Jehovah Sabaoth, who issued the feminine passive potency Hod, הוד, Splendor, or Elohim Sabaoth; the two produced Jesod, יסוד, Foundation, who is the mighty living one El-Chai, thus yielding the third trinity or “head.” The tenth Sephiroth is rather a duad, and is represented on the diagrams as the lowest circle. It is Malchuth or Kingdom, מלכות, and Shekinah שכינה, also called Adonai, and Cherubim among the angelic hosts. The first “Head” is called the Intellectual world; the second “Head” is the Sensuous, or the world of Perception, and the third is the Material or Physical world.—H.P. Blavatsky, Isis Unveiled, II:213
The ten Sephiroth are divided into three classes, each of them presenting to us the divinity under a different aspect, the whole still remaining an indivisible Trinity.
The first three Sephiroth are purely intellectual in metaphysics, they express the absolute identity of existence and thought, and form what the modern kabalists called the intelligible world—which is the first manifestation of God.
The three that follow, make us conceive God in one of their aspects, as the identity of goodness and wisdom; in the other they show to us, in the Supreme good, the origin of beauty and magnificence (in the creation). Therefore, they are named the virtues, or the sensible world.
Finally, we learn, by the last three Sephiroth, that the Universal Providence, that the Supreme artist is also absolute Force, the all-powerful cause, and that, at the same time, this cause is the generative element of all that is. It is these last Sephiroth that constitute the natural world, or nature in its essence and in its active principle. Natura naturans.—Adolfe Franck, Die Kabala (tr. H.P. Blavatsky, Isis Unveiled, II:40)
Diagram from Qabbalah, by Issac Myer: