CCC 504

Jesus is conceived by the Holy Spirit in the Virgin Mary's womb because he is the New Adam, who inaugurates the new creation: "The first man was from the earth, a man of dust; the second man is from heaven."¹⁶² I Cor 15:45, 47. From his conception, Christ's humanity is filled with the Holy Spirit, for God "gives him the Spirit without measure."¹⁶³ Jn 3:34. From "his fullness" as the head of redeemed humanity "we have all received, grace upon grace."¹⁶⁴ Jn 1:16; cf. Col 1:18.