CCC#484. The Annunciation of Mary inaugurates the fullness of time, But when the fullness of the time was come, God sent his Son, made of a woman, made under the law: (Gal4:4) Mary was invited to conceive him in whom the “fullness of deity” would dwell bodily. ” For in him dwells all the fullness of the Godhead corporeally;” (Col2:9) the divine response to the question, How can this be, since I know not man?” was given by the power of the Holy Spirit will come upon you.” “And Mary said to the angel: How shall this be done, because I know not man? And the angel answering, said to her: The Holy Ghost shall come upon thee, and the power of the most High shall overshadow thee. And therefore also the Holy which shall be born of thee shall be called the Son of God. (Lk1:35-35)
CCC#485. The mission of the Holy Spirit is always conjoined and ordered to that of the Son.122 “ He shall glorify me; because he shall receive of mine, and shall shew it to you. All things whatsoever the Father hath, are mine. Therefore I said, that he shall receive of mine, and shew it to you.” He shall glorify me; because he shall receive of mine, and shall shew it to you. All things whatsoever the Father hath, are mine. Therefore I said, that he shall receive of mine, and shew it to you. The Holy Spirit, “the Lord, the giver of Life”, is sent to sanctify the womb of the Virgin Mary and divinely fecundate it, causing her to conceive the eternal Son of the Father in a humanity drawn from her own.
CCC#486. The Father’s only Son, conceived as man in the womb of the Virgin Mary, is “Christ”, that is to say, anointed by the Holy Spirit, from the beginning of his human existence, though the manifestation of this fact takes place only progressively: to the shepherds, to the magi, to John the Baptist, to the disciples.123 “And she shall bring forth a son: and thou shalt call his name JESUS. For he shall save his people from their sins.” (Mt1:20; 2:1-12) Thus the whole life of Jesus Christ will make manifest “how God anointed Jesus of Nazareth with the Holy Spirit and with power.”124 ” Jesus of Nazareth: how God anointed him with the Holy Ghost, and with power, who went about doing good, and healing all that were oppressed by the devil, for God was with him.” (Acts10:38)