In invisible and nameless heights there was a perfect Aeon pre-existent. His name is Fore-Beginning, Fore-Father, and Abyss. No thing can comprehend him.
Jonas documents the Valentinian identification of the Abyss as the supreme, incomprehensible pre-existent First Principle from which all emanation originates.
, The Gnostic Religion: The Message of the Alien God and the Beginnings of Christianity, 1958thesis