21. At the present day many think of the Lord no otherwise than as of a common man like themselves, because they think solely of His Human, and not at the same time of His Divine, when yet His Divine and His Human cannot be separated. For the Lord is God and Man, and God and Man in the Lord are not two, but one Person, yes, altogether one, just as soul and body are one man, according to the doctrine received in the whole Christian world which was formulated by Councils, and is called the doctrine of the Athanasian Creed. Therefore, lest anyone should in future separate in his thought the Divine and the Human in the Lord, I pray him to read the passages from Luke quoted above, and also the following in Matthew:
The birth of Jesus Christ was on this wise. When His mother Mary had been betrothed to Joseph, before they came together, she was found with child of the Holy Spirit. And Joseph her betrothed, being a just man, and not willing to make her a public example, was minded to put her away privily. But while he thought on these things, behold, an angel of the Lord appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy betrothed, for that which is begotten [natus] in her is of the Holy Spirit. And she shall bring forth a son, and thou shalt call His name Jesus for He shall save His people from their sins. And Joseph, being awaked from sleep, did as the angel of the Lord commanded him, and took unto him his betrothed, but knew her not till she had brought forth her firstborn son; and he called His name Jesus (Matt. 1:18-25).
From these words, and from those written in Luke concerning the Lord's nativity, and from others adduced above, it is evident that the "Son of God" is Jesus conceived of Jehovah the Father, and born of the Virgin Mary, of whom all the Prophets and the Law prophesied until John.