Catechism of the Catholic Church: Article 3:"He Was Conceived by the Power of the Holy Spirit, and Was Born of the Virgin Mary"
In Brief
479At the time appointed by God, the only Son of the Father, the eternal Word, that is, the Word and substantial Image of the Father, became incarnate; without losing his divine nature he has assumed human nature.
480Jesus Christ is true God and true man, in the unity of his divine person; for this reason he is the one and only mediator between God and men.
481Jesus Christ possesses two natures, one divine and the other human, not confused, but united in the one person of God's Son.
482Christ, being true God and true man, has a human intellect and will, perfectly attuned and subject to his divine intellect and divine will, which he has in common with the Father and the Holy Spirit.
483The Incarnation is therefore the mystery of the wonderful union of the divine and human natures in the one person of the Word.
Notes
70 1 Jn 4:10; 4:14; 3:5.
71 St. Gregory of Nyssa, Orat. catech 15: PG 45, 48B.
72 1 Jn 4:9.
73 Jn 3:16.
74 Mt 11:29; Jn 14:6.
75 Mk 9:7; cf. Dt 6:4-5.
76 Jn 15:12.
77 Cf. Mk 8:34.
78 2 Pt 1:4.
79 St. Irenaeus, Adv. haeres. 3, 19, 1: PG 7/1, 939.
80 St. Athanasius, De inc. 54, 3: PG 25, 192B.
81 St. Thomas Aquinas, Opusc. 57, 1-4.
82 Jn 1:14.
83 Phil 2:5-8; cf. LH, Saturday, Canticle at Evening Prayer.
84 Heb 10:5-7, citing Ps 40:6-8 ([7-9] LXX).
85 1 Jn 4:2.
86 1 Tim 3:16.
87 Cf. 1 Jn 4:2-3; 2 Jn 7.
88 Council of Nicaea I (325): DS 130, 126.
89 Council of Ephesus (431): DS 250.
90 Council of Ephesus: DS 251.
91 Council of Chalcedon (451): DS 301; cf. Heb 4:15.
92 Council of Chalcedon: DS 302.
93 Council of Constantinople II (553): DS 424.
94 Council of Constantinople II (553): DS 432; cf. DS 424; Council of Ephesus, DS 255.
95 LH, 1 January, Antiphon for Morning Prayer; cf. St. Leo the Great, Sermo in nat. Dom. 1, 2; PL 54, 191-192.
96 Liturgy of St. John Chrysostom, Troparion "O monogenes."
97 GS 22 § 2.
98 Cf. Jn 14:9-10.
99 GS 22 § 2.
100 Cf. Damasus 1: DS 149.
101 Lk 2:52.
102 Cf. Mk 6:38; 8:27; Jn 11:34; etc.
103 Phil 2:7.
104 Cf. St. Gregory the Great, "Sicut aqua" ad Eulogium, Epist. Lib. 10, 39 PL 77, 1097A ff.; DS 475.
105 St. Maximus the Confessor, Qu. et dub. 66: PG 90, 840A.
106 Cf. Mk 14:36; Mt 11:27; Jn 1:18; 8:55; etc.
107 Cf. Mk 2:8; Jn 2:25; 6:61; etc.
108 Cf. Mk 8:31; 9:31; 10:33-34; 14:18-20, 26-30.
109 Cf. Mk 13:32, Acts 1:7.
110 Cf. Council of Constantinople III (681): DS 556-559.
111 Council of Constantinople III: DS 556.
112 Cf. Council of the Lateran (649): DS 504.
113 Cf. Gal 3:1; cf. Council of Nicaea II (787): DS 600-603.
114 Roman Missal, Preface of Christmas I.
115 Council of Nicaea II: DS 601.
116 Gal 2:20.
117 Cf. Jn 19:34.
118 Pius XII, encyclical, Haurietis aquas (1956): DS 3924; cf. DS 3812.