The cross, which had been Saul's stumbling-block, deeply affronting his Jewish pride, from this moment was transformed. The glory of the exalted Redeemer cast back its light upon the tree of shame. The curse of the Law visibly resting upon Him, the rejection of men, marked Him out as God's chosen sacrifice for sin. This explanation at once presented itself to an instructed and keenly theological mind like Saul's, so soon as it was evident that Jesus was not accursed, as he had supposed, but approved by God. So Paul's gospel was given him at a stroke. Jesus Christ dying for our sins, Jesus Christ living to save and to rule--behold "the good news"! The Apostle had it on no less authority than that of the risen Saviour. From Him he received it to publish wide as the world. Thus Saul of Tarsus was born again. And with the Christian man, the Christian thinker, the theologian, was born in him. The Pauline doctrine has its root in Paul's conversion. It was a single, organic growth, the seed of which was this "revelation of Jesus Christ." Its creative impulse was given in the experience of the memorable hour, when "God who said, Light shall shine out of darkness, in the face of Jesus Christ shined" into Saul's heart. As the light of this revelation penetrated his spirit, he recognised, step by step, the fact of the resurrection, the import of the crucifixion, the Divinity of Jesus, His human mediatorship, the virtue of faith, the office of the Holy Spirit, the futility of Jewish ritual and works of law, and all the essential principles of his theology. Given the genius of Saul and his religious training, and the Pauline system of doctrine was, one might almost say, _a necessary deduction_ from the fact of the appearance to him of the glorified Jesus. If that form of celestial splendour was Jesus, then He was risen indeed; then He was the Christ; He was, as He affirmed, the Son of God. If He was Lord and Christ, and yet died by the Father's will on the cross of shame, then His death could only be a propitiation, accepted by God, for the sins of men, whose efficacy had no limit, and whose merit left no room for legal works of righteousness. If this Jesus was the Christ, then the assumptions of Saul's Judaism, which had led him into blasphemous hatred and outrage towards Him, were radically false; he will purge himself from the "old leaven," that his life may become "a new lump." From that moment a world of life and thought began for the future Apostle, the opposite in all respects of that in which hitherto he had moved. "The old things," he cries, "passed away; lo, they have become new" (2 Cor. v. 17). Paul's conversion was as complete as it was sudden.