7 But by the side of this timeless and ineffable generation of the Only-begotten, which transcends the perception of human understanding, we taught as well the mystery of God born to be man from the womb of the Virgin, showing how according to the plan of the Incarnation, when He emptied Himself of the form of God and took the form of a servant, the weakness of the assumed humanity did not weaken the divine nature, but that Divine power was imparted to humanity without the virtue of divinity being lost in the human form. For when God was born to be man the purpose was not that the Godhead should be lost, but that, the Godhead remaining, man should be born to be God. Thus Emmanuel is His name, which is God with us, that God might not be lowered to the level of man, but man raised to that of God. Nor, when He asks that He may be glorified, is it in any way a glorifying of His divine nature, but of the lower nature He assumed: for He asks for that glory which He had with God before the world was made.
Source: On the Trinity (New Advent)