It is written:
Neither shall thy name any more be called Abram, but thy name shall be Abraham; for [as Brahma] a father of many nations have I made thee... As for Sarai thy wife, thou shalt not call her name Sarai, but Sarah shall her name be. And [as Saraswati] I will bless her, and give thee [Agni as] a son also of her: yea, I will bless her [the Brazen Serpent], and she shall be a mother of nations; kings [Malachim] of people shall be of her. - Genesis 17: 5, 15, 16
“For in Isaac will [Agni, the fires of] your seed be called [a child] to thee [יהוה].” - Genesis 21:12
The first letter “Hei” of Iod-Hei-Vav-Hei יהוה was added to the name Abram when he, as Chesed, awoke, within Malkuth, the shakti potential of “Hei” - the brazen serpent - by gathering with Sarai his spouse, the waters below the firmament; thus becoming Abraham as Brahama, the creator.
The addition of the first “Hei” of Iod-Hei-Vav-Hei to Abram, symbolizes the divine life of “יה” “Jah” Father-Mother, the Holy Spirit descending from Daath into Malkuth, the second “Hei” of Iod-Hei-Vav-Hei that was added to the name of Sarai; thus Sarai became Saraswati or simply Sarah, who became the second “Hei” or physical essential receptor of the shakti potential of the first “Hei” - the brazen serpent, by gathering in her womb - the spinal medulla - the fires of Geburah-Isaac. This indicates that both have entered into the First Initiation of Major Mysteries, the awakening of the Kundalini in Malkuth, their Physicality.
This is how we, as Abraham and Sarah, that is, as Chesed-Abraham initiatically engender and bring forth Isaac, a child of light, into Sarah, Malkuth our physicality.
The union of the two letters “Hei” of Iod-Hei-Vav-Hei, that is, the alchemical union of the shakti potential of the sexual organs of Abraham and Sarah, Brahama and Saraswati, awakens the fire of the Holy Ghost, which is the “Iod” of Iod-Hei-Vav-Hei, and which is the first letter in the name Isaac (יצחק) a symbol of the flame principle of Geburah, which through a burnt-offering - sexual alchemy – increases the flame in the spinal medulla, in the Sushumna canal, the land of Moria, the letter “Vav” of Iod-Hei-Vav-Hei upon Malkuth, our physicality; this is how the Monad - Chesed begins to be born as a Master in the sixth dimension - as a sacrifice that the terrestrial soul of those - who in Malkuth - delightfully follow the will of their Innermost.
The birth of Isaac, or the first initiation of major mysteries, is the union of justice with mercy, Geburah and Chesed, respectively; these two divine archetypes are, symbolized by the patriarchs Isaac and Abraham.
The reabsorption of Isaac, or the fires of Geburah, from Sarah, Malkuth, by Binah, the Holy Spirit, is an alchemical sacrifice that has to be done in order to blend Geburah and Chesed, so that a Master can be born in heaven. This is a mystery of Alchemy that has to be done and experienced by Israel, the human soul, the essence of the Alchemists.
Sara-swa-ti in Sanskrit means: "Sara" means "essence" - "swa" means "self," - and lastly "ti" is the verb that completes and gives the meaning of the name. Thus Saraswati means "the essence of the self." Saraswati is represented in Hindu mythology as the divine consort of Lord Brahma, the Creator of the universe. Since knowledge [Gnosis-Daath] is necessary for creation, Saraswati symbolizes the creative power of Brahma.