The Holy Ghost shall come upon thee. — See Note on Luke 1:15. Here, however, the context would suggest to one familiar with the sacred writings, another aspect of the Spirit’s work, as quickening the dead chaos into life (Genesis 1:2), as being the source of life to all creation (Psalms 104:30).
The power of the Highest shall overshadow thee. — The divine name is used in obvious harmony with “the Son of the Highest” in Luke 1:32.
Therefore also... shall be called the Son of God. — The words appear to rest the title, “Son of God,” rather on the supernatural birth than on the eternal pre-existence of the Son as the Word that was “in the beginning with God and was God” (John 1:1), and we may accept the fact that the message of the angel was so far a partial, not a complete, revelation of the mystery of the Incarnation. It gave a sufficient reason for the name which should be given to the Son of Mary, and more was not then required.