Adam knew (Daath) Eve by means of fornication and she begat קין Cain.
Explanation: the brain, Adam, Pingala, Od, the intellect, engendered Cain (the Bestial Subjective Mind) by means of the fornication through Eve, the Lunar Serpent Ob. Cain is not illuminated intellect but Satanic Intellect.
The Consciousness, הבל “Abel,” is part of Neshamah, the Spiritual Soul. With subjective reasoning we get the birth of Cain – animal intellect, or bestial mind. Cain was working with the earth, with the senses of the physical body. Cain was stronger than his brother Abel (Soul or better said; Buddhata).
Cain kills Abel, symbolising that the Soul was not strong enough to control the sensual mind.
Abel (the Buddhata) was weak and identified with the vanities of world through Cain, the sensual mind. And so Cain, the Bestial Subjective Intellectual Mind was the first murderer of the soul, and also a thief, because he stole the consciousness “Abel” when the latter remained trapped within the sensual mind; or in other words, Cain (the subjective intellect) killed Abel (the consciousness or Buddhata).