The answer
There was no time when the Son of God was not.
Light emanates from the sun, but there is no son without light.
Thus, the Son was begotten of the Father, but there is no Father without the Son. The existence of the Son is innate to the existence of the Father, just as the existence of light is innate to the existence of the sun, and the existence of thought is to the mind.
All this, means that all The Father's Divine characteristics (e.g.: eternity, omnipotence, omniscience, all-holiness) are also for the Son, because the Father and the Son have one essence.
His Holiness Pope Tawadros II
Pope Tawadros II, My Faith: A Series of Dialogues on the Creed (Coptic Orthodox Patriarchate, 2014), 48–49.
The pages in the book (48–49)
