He is the Only Begotten; and is styled the Father, the Beginning of all, inasmuch as from him are derived immediately or mediately the remaining Aeons who complete the Ogdoad (eight), thence the Decad (ten), and thence the Dodecad (twelve); in all thirty, Aeons constituting the Pleroma. He alone is capable of knowing the Propator; but when he desired to impart like knowledge to the other Aeons, was withheld from so doing by Sige. When Sophia (wisdom), youngest Aeon of the thirty, was brought into peril by her yearning after this knowledge, Nous was foremost of the Aeons in interceding for her.