But when God, who had set me apart even from my mother’s womb and called me through His grace, was pleased to reveal His Son in me so that I might preach Him among the Gentiles … (Gal 1:15-16a)

“The risen Christ appeared to Paul on the Damascus road as God’s Son, that is, the content of the revelation was Jesus as the Son of God. In recent years Seyoon Kim has brought the importance of Paul’s Damascus road experience for an understanding of his faith and theology back to the centre of the discussion. Kim’s claim is that crucial emphases in Paul’s gospel, especially his Christology, soteriology and universal mission, were formed in large measure in that encounter itself. The gospel which Paul received on the Damascus road, and thus the content of his preaching, may be defined christologically: it is Jesus Christ, the Son of God (Gal 1:12, 16; cf. 2 Cor 4:4; Eph 3:8) who is the crucified, risen and ascended Lord.…

God’s gracious purpose in revealing his Son in him was that ‘he might preach him among the Gentiles’. This was an integral part of the revelation itself. When Paul refers back to the Damascus road christophany his missionary calling to the Gentiles is often in view: he was entrusted with the gospel of the uncircumcision (Gal 2:7; 1 Thess 2:4), having ‘received grace and apostleship to bring about the obedience of faith among all the Gentiles’ (Rom 1:5). Paul was given grace by God to be a minister for the Gentiles in the priestly service of the gospel (Rom 15:15-16). The ‘logic of the gospel according to Paul’ required that he should proclaim the Son of God to the nations and he grasped the essentials of it there and then. This is not to deny that his convictions about this calling grew or that he came to a deeper understanding of the magnitude of his missionary task. But the main lines of Paul’s preaching Christ to the Gentiles were already set at the time of the Damascus road revelation. That he seems to have entered his ministry without delay serves to confirm this.” (O’ Brien, Peter. Gospel and Mission in the Writings of Paul, 4-5)

And immediately he began to proclaim Jesus in the synagogues, saying, He is the Son of God (Act 9:20)