Feast of St Daniel the Stylite of Constantinople and St Luke the New Stylite of Chalcedon
AFTER THE holy Virgin had given her assent, the Holy Spirit came upon her according to the Lord’s word, which the angel had spoken, and purified her and gave her the power both to receive the divinity of the Word and to beget. Then the subsistent Wisdom and Power of the Most High, the Son of God, the Consubstantial with the Father, overshadowed her like a divine seed and from her most chaste and pure blood compacted for Himself a body animated by a rational and intellectual soul as first-fruits of our clay. This was not by seed, but by creation through the Holy Spirit, with the form not being put together bit by bit, but being completed all at once with the Word of God Himself serving as the person to the flesh. For the divine Word was not united to an already subsistent flesh, but, without being circumscribed, came in His own person to dwell in the womb of the holy Virgin and from the chaste blood of the ever-virgin made flesh subsist animated by a rational and intellectual soul. Taking to Himself the first-fruits of the human clay, the very Word became person to the body. Thus, there was a body which was at once the body of God the Word and an animate, rational, intellectual body. Therefore, we do not say that man became God, but that God became man. For, while He was by nature perfect God, the same became by nature perfect man. He did not change His nature and neither did He just appear to become man. On the contrary, without confusion or alteration or division He became hypostatically united to the rationally and intellectually animated flesh which He had from the holy Virgin and which had its existence in Him. He did not transform the nature of His divinity into the substance of His flesh, nor the substance of His flesh into the nature of His divinity, and neither did He effect one compound nature out of His divine nature and the human nature which He had assumed.
—St John of Damascus, An Exact Exposition of the Orthodox Faith