So Justin compared the begetting of the Son to that of a fire being started from a larger fire. Both fires are of the same "substance". So the Father and the Son are both "God" in essence. But when the Son of God was born as a human being he divested himself of all of his divine attributes.Brother Alan wrote:What do you mean when you say that Christ retained only His identity when He became man (but, no longer was a Divine Person)?]
Indeed, the Council of Ephesus (back in 431) succinctly affirmed both the divinity and the humanity of Christ by asserting that Jesus' Mother, Mary, can be most fittingly referred to as, "The Mother of God".
I will comment on your statement first, and then address your question.
You are right, and that was unwise. Originally the assertion was not that Mary was "The Mother of God", but that she was "ο θεοτοκος" (the theotokos) "The God-bearer". She bore the one who was God, the one who had been God prior to his birth. He was fully Man while he was a human being on earth, and referred to himself usually as "the son of man" and seldom as "the son of God". However, in one sense, He was God while on earth in virtue of His identity!
So let me explain from the beginning. We should be very clear what we mean when we say that Jesus is God. In what sense is he God? Surely not in the modalist sense, id est, that he is the same divine Individual as the Father, and that this one God expresses Himself as the Father, the Son, and the Holy Spirit, that these three may be compared to three actor's masks which he puts on. The masks look different, but there is only one man behind them . If you are a trinitarian, you think of God not as a divine Person, but as a mysterious "substance" or "essence" made up of three divine Persons, each one of whom is God because each is in some way made up of this Divine Substance which is confined to those three alone.
Now let me share my understanding of the first and second-century Christians concerning the son of God. They taught that God begat his son "before all ages". They understood it as a single act. I believe that it was not only "before all ages" but that that single act marked the beginning of time. There was no "before" the beginning of time. For the word "before" indicates a relation to some event which has occurred in time. At the beginning of time, God existed (we can't say He existed "before" the beginning of time, because there was no "before" so that would be nonsense). Instantly at the beginning of time, God begat his son. So there was no time at which the son of God did not exist (as the Arians affirmed). Now dogs beget dogs, and their offspring are canine. Man begets man, and his offspring is human. God begets God and his offspring is divine. This is the sense in which the son of God was God. Justin Martyr who discussed Christ for days with a group of Jewish men headed by Trypho, gave this explanation:
"I shall give you another testimony, my friends," said I, "from the scriptures, that God begat before all created things, a Beginning, a certain rational power from Himself, who is called by the Holy Spirit, now the glory of the Lord, now the Son, again Wisdom, again an Angel, then God, and then Lord and Logos; and on another occasion, He calls Himself Captain, when He appeared in Human form to Joshua the son of Nave. For He can be called by all those names, since He ministers to the Father's will, and since He was begotten of the Father by an act of will;... just as we see happening in the case of a fire, which is not lessened when it has kindled [another], but remains the same; and that which has been kindled by it likewise appears to exists by itself, not diminishing that from which it was kindled." Justin Martyr (110-165 A.D.) Dialogue with Trypho Chapter 61 from the Ante-Nicene Fathers volume 1
Have this mind among yourselves, which is yours in Christ Jesus, who, though he was in the form of God, did not count equality with God a thing to be grasped, but emptied himself, taking the form of a servant, being born in the likeness of men, and being found in human form he humbled himself and became obedient unto death, even death on a cross. Philippians 2:5-8 RSV
So was this great self-emptying not an emptying of himself of his divine attributes, so that practically he was no longer divine. He was unable to perform any miracles, though the Father performed many miracles through Him. He got hungry and thirsty like everyone else. As a baby, he cried (in spite of "Away in a Manger"), and he wet his diapers (or whatever the equivalent was) just like any other baby. He did not stand up at 10 months old and give great orations as the gnostics affirmed. He was FULLY human in every way. He was tempted in ALL ways just as we are, but was without sin for he was filled with the spirit of God and chose not to sin on each and every occasion when he was tempted. What do I mean when I say that he retained his identity? He was still that same individual person whom God begat at the beginning of time. He knew about his pre-existance; he knew that he was the son of God, at least when he was older. He said, "Before Abraham was, I am."
So is it correct to say that Jesus was God while he walked this earth? Yes, it is correct in this sense. He was that same divine individual who was begotten as the Son of God, and event which marked the beginning of time. But to think of him, while he was on earth, as God in the sense that he had intrinsic divine powers apart from the Father's work in and through him, would be an error.