Luke
Acts 9:16BSB·traditional attribution

I will show him how much he must suffer for My name.”

John Calvin Reformed @genevareformer

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.

Matthew Henry Presbyterian @wholebiblehenry

As for God, his work is perfect; if he begin, he will make an end: a good work was begun in Saul, when he was brought to Christ's feet, in that word, Lord, what wilt thou have me to do? And never did Christ leave any that were brought to that. Though Saul was sadly mortified when he lay three days blind, yet he was not abandoned.

Commenting on Acts 9:10-22

John Gill Reformed Baptist @doctorgill

For I will show him,.... In vision, and by prophecy, either now, or hereafter; or by facts, as they come upon him: how great things he must suffer for my name's sake; such as weariness, pain, and watchings, hunger, thirst, fastings, cold, and nakedness, perils on various accounts, and from different quarters, stripes, scourges, imprisonment, shipwreck, stoning, and death, of which he himself gives a...