"The Being, the Innermost of each one of us, has Twin Souls: the Spiritual and the Human Souls. In the ordinary intellectual animal, the Being, the Innermost, is not born, does not die, is not reincarnated, but it does send the Essence to each new personality. The Essence is a fraction of the Human Soul, the Buddhata... We can and must affirm, beyond all doubt, that only a fraction of the Human Soul lives within the Lunar Bodies. This fraction is the Essence, the psychic material that creates a Soul, develops the Human Soul, and thereby the Spiritual Soul. The Monad, the Being, creates, fabricates, develops his two Souls, and these Souls must serve and obey him. We must distinguish between Monads and Souls. A Monad, in other words, a Spirit, is. A Soul is acquired." - Samael Aun Weor, Practical Astrology
"The Innermost [Atman] is the Sephirah Chesed, and Buddhi [Buddhi] is the Sephirah Geburah. The Innermost and Buddhi express themselves through the Human Soul. The Human Soul [Manas] is Tiphereth, willpower, beauty." - Samael Aun Weor, Tarot and Kabbalah
"Atman unfolds Himself into the Spiritual Soul. The Spiritual Soul unfolds into the Human Soul who is the Superior Manas; the Human Soul unfolds into the Essence, or Buddhata." - Samael Aun Weor, Tarot and Kabbalah
"Every elemental Essence can convert itself into a human soul, at its time and hour, and according to the law." - Samael Aun Weor, The Gnostic Bible: The Pistis Sophia Unveiled
From the Human Soul descends the percentage of free consciousness that enters into manifestation in a physical body. That Essence is only a fraction of the Human Soul. The Human Soul is incarnated in the Human Being when the initiate enters into the world of Tiphereth in the Fifth Initiation of Major Mysteries.