13 Jesus of Nazareth brings God's plan to fulfillment. After receiving the Holy Spirit at his Baptism, Jesus makes clear his messianic calling: he goes about Galilee "preaching the Gospel of God and saying: 'The time is fulfilled, and the kingdom of God is at hand; repent and believe in the Gospel'" (Mk 1:14-15; cf. Mt 4:17; Lk 4:43). The proclamation and establishment of God's kingdom are the purpose of his mission: "I was sent for this purpose" (Lk 4:43). But that is not all. Jesus himself is the "Good News," as he declares at the very beginning of his mission in the synagogue at Nazareth, when he applies to himself the words of Isaiah about the Anointed One sent by the Spirit of the Lord (cf. Lk 4;14-21). Since the "Good News" is Christ, there is an identity between the message and the messenger, between saying, doing and being. His power, the secret of the effectiveness of his actions, lies in his total identification with the message he announces; he proclaims the "Good News" not just by what he says or does, but by what he is. The ministry of Jesus is described in the context of his journeys within his homeland. Before Easter, the scope of his mission was focused on Israel. Nevertheless, Jesus offers a new element of extreme importance. The eschatological reality is not relegated to a remote "end of the world," but is already close and at work in our midst. The kingdom of God is at hand (cf. Mk 1:15); its coming is to be prayed for (cf. Mt 6:10); faith can glimpse it already at work in signs such as miracles (cf. Mt 11:4-5) and exorcisms (cf. Mt 12:25-28), in the choosing of the Twelve (cf. Mk 3:13-19), and in the proclamation of the Good News to the poor (cf. Lk 4:18). Jesus' encounters with Gentiles make it clear that entry into the kingdom comes through faith and conversion (cf. Mk 1:15), and not merely by reason of ethnic background. The kingdom which Jesus inaugurates is the kingdom of God. Jesus himself reveals who this God is, the One whom he addresses by the intimate term "Abba," Father (cf. Mk 14:36). God, as revealed above all in the parables (cf. Lk 15:3-32; Mt 20:1-16), is sensitive to the needs and sufferings of every human being: he is a Father filled with love and compassion, who grants forgiveness and freely bestows the favors asked of him. St. John tells us that "God is love" (1 Jn 4:8, 16). Every person therefore is invited to "repent" and to "believe" in God's merciful love. The kingdom will grow insofar as every person learns to turn to God in the intimacy of prayer as to a Father (cf. Lk 11:2; Mt 23:9) and strives to do his will (cf. Mt 7:21).
Source: Redemptoris Missio (Vatican.va)