The conversion of Saul of Tarsus was an amazing event. Saul loathed the very name of Christ. He blasphemed Him and caused others to be tortured so as to compel them to blaspheme that holy name. He led his nation and the world in rebellion against the resurrected, glorified Christ — the world which had already disowned and crucified the lowly Jesus.
But as Saul went to Damascus, still “breathing out threatenings and slaughter against the disciples of the Lord” (Acts 9:1), God did a wonderful thing. Rather than crush the leader of the world’s rebellion, He saved him. Christ broke through the heavens, as it were, to speak words of pity to His greatest enemy on earth. As a result Saul’s rebellious spirit was broken and in one moment the pitiless persecutor became the docile, indeed the devoted follower of Christ.
More than this, Saul of Tarsus, the persecutor, became Paul the Apostle. To him the glorified Lord committed “the dispensation of the grace of God” (Eph. 3:2) and “the gospel of the grace of God” (Acts 20:24). Now he went everywhere proclaiming grace, telling men how God loved them, how Christ had come into the world and had gone to Calvary to pay man’s debt of sin so that believing sinners might be saved.
“The gospel of the grace of God,” found in Paul’s epistles, does not blame anyone for the death of Christ. Rather it presents the cross as good news. It declares that “we have redemption through His blood, the forgiveness of sins according to the riches of His grace” (Eph. 1:7). It says that “God hath concluded them all in unbelief that He might have mercy upon all” (Rom. 11:32) and that “where sin abounded, grace did much more abound” (Rom. 5:20). Thus the vilest sinner may believe and rejoice in the consciousness of sins forgiven. source