“Adam and Eve, in the Genesis account, had three sons whose names are recorded; the first two, Cain and Abel, gained an unpleasant fame as the first murderer and his first victim.
The third, however, was named Seth, and had a different destiny. The Bible says little about him, but legend tells that he journeyed back to the gate of Eden and spoke to the angels who guarded the gate.
From them, according to one story, he received the secret teaching which was to become the Cabala.”
–John Michael Greer, Paths of Wisdom, the Magical Cabala in the Western Tradition, 1996, pg. 81.