Paragraph 2. "CONCEIVED BY THE POWER OF THE HOLY SPIRIT AND BORN OF THE VIRGIN MARY"
Catechism number 485
The mission of the Holy Spirit is always conjoined and ordered to that of the Son.122 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.