At midday, O king, I saw in the way a light from heaven above the brightness of the sun, shining round about me, and them that were in company with me. And when we were all fallen down on the ground, I heard a voice speaking to me in the Hebrew tongue: Saul, Saul, why persecutest thou me? It is hard for thee to kick against the goad. And I said: Who art thou, Lord? And the Lord answered: I am Jesus whom thou persecutest.
But rise up, and stand upon thy feet: for to this end have I appeared to thee, that I may make thee a minister, and a witness of those things which thou hast seen, and of those things wherein I will appear to thee, Delivering thee from the people, and from the nations, unto which now I send thee: To open their eyes, that they may be converted from darkness to light, and from the power of Satan to God, that they may receive forgiveness of sins, and a lot among the saints, by the faith that is in me.
~Acts of the Apostles 26:13-18
Jesus calls to conversion. This call is an essential part of the proclamation of the kingdom: "The time is fulfilled, and the kingdom of God is at hand; repent, and believe in the gospel." In the Church's preaching this call is addressed first to those who do not yet know Christ and his Gospel. Also, Baptism is the principal place for the first and fundamental conversion. It is by faith in the Gospel and by Baptism that one renounces evil and gains salvation, that is, the forgiveness of all sins and the gift of new life.
Christ's call to conversion continues to resound in the lives of Christians. This second conversion is an uninterrupted task for the whole Church who, "clasping sinners to her bosom, [is] at once holy and always in need of purification, [and] follows constantly the path of penance and renewal." This endeavor of conversion is not just a human work. It is the movement of a "contrite heart," drawn and moved by grace to respond to the merciful love of God who loved us first.
St. Peter's conversion after he had denied his master three times bears witness to this. Jesus' look of infinite mercy drew tears of repentance from Peter and, after the Lord's resurrection, a threefold affirmation of love for him. The second conversion also has a communitarian dimension, as is clear in the Lord's call to a whole Church: "Repent!"
~Catechism of the Catholic Church, Paragraphs 1427-1429
