CCC 74 God “desires all men to be saved and to come to the knowledge of the truth”:1 that is, of Christ Jesus.2 Christ must be proclaimed to all nations and individuals, so that this revelation may reach to the ends of the earth:
God graciously arranged that the things he had once revealed for the salvation of all peoples should remain in their entirety, throughout the ages, and be transmitted to all generations.3

CCC 151 For a Christian, believing in God cannot be separated from believing in the One he sent, his “beloved Son”, in whom the Father is “well pleased”; God tells us to listen to him.4 The Lord himself said to his disciples: “Believe in God, believe also in me.”5 We can believe in Jesus Christ because he is himself God, the Word made flesh: “No one has ever seen God; the only Son, who is in the bosom of the Father, he has made him known.”6 Because he “has seen the Father”, Jesus Christ is the only one who knows him and can reveal him.7

CCC 459 The Word became flesh to be our model of holiness: “Take my yoke upon you, and learn from me.” “I am the way, and the truth, and the life; no one comes to the Father, but by me.”8 On the mountain of the Transfiguration, the Father commands: “Listen to him!”9 Jesus is the model for the Beatitudes and the norm of the new law: “Love one another as I have loved you.”10 This love implies an effective offering of oneself, after his example.11

CCC 470 Because “human nature was assumed, not absorbed”,12 in the mysterious union of the Incarnation, the Church was led over the course of centuries to confess the full reality of Christ’s human soul, with its operations of intellect and will, and of his human body. In parallel fashion, she had to recall on each occasion that Christ’s human nature belongs, as his own, to the divine person of the Son of God, who assumed it. Everything that Christ is and does in this nature derives from “one of the Trinity”. The Son of God therefore communicates to his humanity his own personal mode of existence in the Trinity. In his soul as in his body, Christ thus expresses humanly the divine ways of the Trinity:13
The Son of God. .. worked with human hands; he thought with a human mind. He acted with a human will, and with a human heart he loved. Born of the Virgin Mary, he has truly been made one of us, like to us in all things except sin.12

CCC 516 Christ’s whole earthly life – his words and deeds, his silences and sufferings, indeed his manner of being and speaking – is Revelation of the Father. Jesus can say: “Whoever has seen me has seen the Father”, and the Father can say: “This is my Son, my Chosen; listen to him!”15 Because our Lord became man in order to do his Father’s will, even the least characteristics of his mysteries manifest “God’s love. .. among us”.16

CCC 661 This final stage stays closely linked to the first, that is, to his descent from heaven in the Incarnation. Only the one who “came from the Father” can return to the Father: Christ Jesus.17 “No one has ascended into heaven but he who descended from heaven, the Son of man.”18 Left to its own natural powers humanity does not have access to the “Father’s house”, to God’s life and happiness.19 Only Christ can open to man such access that we, his members, might have confidence that we too shall go where he, our Head and our Source, has preceded us.20

CCC 1025 To live in heaven is “to be with Christ.” The elect live “in Christ,”21 but they retain, or rather find, their true identity, their own name.22
For life is to be with Christ; where Christ is, there is life, there is the kingdom.23

CCC 1614 In his preaching Jesus unequivocally taught the original meaning of the union of man and woman as the Creator willed it from the beginning permission given by Moses to divorce one’s wife was a concession to the hardness of hearts.24 The matrimonial union of man and woman is indissoluble: God himself has determined it “what therefore God has joined together, let no man put asunder.”25

CCC 1698 The first and last point of reference of this catechesis will always be Jesus Christ himself, who is “the way, and the truth, and the life.”26 It is by looking to him in faith that Christ’s faithful can hope that he himself fulfills his promises in them, and that, by loving him with the same love with which he has loved them, they may perform works in keeping with their dignity:
I ask you to consider that our Lord Jesus Christ is your true head, and that you are one of his members. He belongs to you as the head belongs to its members; all that is his is yours: his spirit, his heart, his body and soul, and all his faculties. You must make use of all these as of your own, to serve, praise, love, and glorify God. You belong to him, as members belong to their head. And so he longs for you to use all that is in you, as if it were his own, for the service and glory of the Father.27
For to me, to live is Christ.28

CCC 2466 In Jesus Christ, the whole of God’s truth has been made manifest. “Full of grace and truth,” he came as the “light of the world,” he is the Truth.29 “Whoever believes in me may not remain in darkness.”30 The disciple of Jesus continues in his word so as to know “the truth [that] will make you free” and that sanctifies.31 To follow Jesus is to live in “the Spirit of truth,” whom the Father sends in his name and who leads “into all the truth.”32 To his disciples Jesus teaches the unconditional love of truth: “Let what you say be simply ‘Yes or No.’”33

CCC 2795 The symbol of the heavens refers us back to the mystery of the covenant we are living when we pray to our Father. He is in heaven, his dwelling place; the Father’s house is our homeland. Sin has exiled us from the land of the covenant,34 but conversion of heart enables us to return to the Father, to heaven.35 In Christ, then, heaven and earth are reconciled,36 for the Son alone “descended from heaven” and causes us to ascend there with him, by his Cross, Resurrection, and Ascension.37

1 1 Tim 2:4.
2 cf. Jn 14:6.
3 DV 7; cf. 2 Cor 1:20; 3:16-4:6.
4 Mk 1:11; cf. 9:7.
5 Jn 14:1.
6 Jn 1:18.
7 Jn 6:46; cf. Mt 11:27.
8 Mt 11:29; Jn 14:6.
9 Mk 9:7; cf. Dt 6:4-5.
10 Jn 15:12.
11 Cf. Mk 8:34.
12 GS 22 # 2.
13 Cf. Jn 14:9-10.
14 GS 22 # 2.
15 Jn 14:9; Lk 9:35; cf. Mt 17:5; Mk 9:7, “my beloved Son”.
16 Jn 4:9.
17 Cf. Jn 16:28.
18 Jn 3:13; cf. Eph 4:8-10.
19 Jn 14:2.
20 Missale Romanum, Preface of the Ascension: sed ut illuc confideremus, sua membra, nos subsequi quo ipse, caput nostrum principiumque, praecessit.
21 Phil 1:23; cf. Jn 14:3; 1 Thess 4:17.
22 Cf. Rev 2:17.
23 St. Ambrose, In Luc., 10, 121: PL 15, 1834A.
24 Cf. Mt 19:8.
25 Mt 19:6.
26 Jn 14:6.
27 St. John Eudes, Tract. de admirabili corde Jesu, 1, 5.
28 Phil 1:21.
29 Jn 1:14; 8:12; Cf. 14:6.
30 Jn 12:46.
31 Jn 8:32; Cf. 17:17.
32 Jn 16:13.
33 Mt 5:37.
34 Cf. Gen 3.
35 Jer 3:19-4:1a; Lk 15:18, 21.
36 Cf. Isa 45:8; Ps 85:12.
37 Jn 3:13; 12:32; 14 2-3; 16:28; 20:17; Eph 4:9-10; Heb 1:3; 2:13.