Christ Jesus came into the world to save sinners; of whom I am chief. 1 Timothy 1:15.
(WGD 142.1)
As Saul yielded himself fully to the convicting power of the Holy Spirit, he saw the mistakes of his life, and recognized the far-reaching claims of the law of God. He who had been a proud Pharisee, confident that he was justified by his good works, now bowed before God with the humility and simplicity of a little child, confessing his own unworthiness, and pleading the merits of a crucified and risen Saviour. Saul longed to come into full harmony and communion with the Father and the Son; and in the intensity of his desire for pardon and acceptance, he offered up fervent supplications to the throne of grace. The prayers of the penitent Pharisee were not in vain. The inmost thoughts and emotions of his heart were transformed by divine grace; and his nobler faculties were brought into harmony with the eternal purposes of God....
(WGD 142.2)
The conversion of Saul is a striking evidence of the miraculous power of the Holy Spirit to convict men of sin. He had verily believed that Jesus of Nazareth had disregarded the law of God, and had taught His disciples that it was of no effect. But after his conversion, Saul recognized Jesus as the one who had come into the world for the express purpose of vindicating His Father’s law. He was convinced that Jesus was the originator of the entire Jewish system of sacrifices.—The Acts of the Apostles, 119, 120.
(WGD 142.3)
Jesus might have done all this work for Paul directly, but this was not His plan. Paul had something to do in the line of confession to the men whose destruction he had premeditated, and God had a responsible work for the men to do whom He had ordained to act in His stead.—Testimonies for the Church 3:431.
(WGD 142.4)