John Calvin on Acts 9:16

16. And because. Paul could not do this, and have Satan quiet, and the world to yield to him willingly; therefore Luke addeth, that he shall be also taught to bear the cross. For the meaning of the words is, I will accustom him to suffer troubles: to endure reproaches, and to abide all manner [of] conflicts, that nothing may terrify him, and keep him back from doing his duty. And when Christ maketh himself Paul’s teacher in this matter, he teacheth that the more every man hath profited in his school, the more able is he to bear the cross. For we strive against it, and refuse it as a thing most contrary, until he make our minds more gentle. Also this place teacheth, that no man is fit to preach the gospel, seeing the world is set against it, save only he which is armed to suffer. Therefore if we will show ourselves faithful ministers of Christ, we must not only crave at his hands the spirit of knowledge and wisdom, but also of constancy and strength, that we may never be discouraged by laboring and toiling; which is the estate of the godly.

Acts 9:17-19

17. And Ananias went and entered into the house, and when he had laid his hands upon him, he said, Brother Saul, the Lord hath sent me, namely Jesus, who appeared to thee in the way as thou camest, that thou mayest recover thy sight, and that thou mayest be filled with the Holy Ghost. 18. And forthwith there fell from his eyes as it had been scales: and he recovered his sight by and by; and arising he was baptized. 19. And when he had taken meat he was strengthened.