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.

For I will show him - This seems to be added to encourage Ananias. He had feared Saul. The Lord now informs him that Saul, hitherto his enemy, would ever after be his friend. He would not merely profess repentance, but would manifest the sincerity of it by encountering trials and reproaches for his sake. The prediction here was fully accomplished, Acts 20:23; 2-Corinthians 11:23-27; 2-Timothy 1:11-12.

How great things he must suffer - Instead of proceeding as a persecutor, and inflicting sufferings on others, I will show him how many things he himself must suffer for preaching that very doctrine which he has been hitherto employed in persecuting. Strange change indeed! And with great show of reason, as with incontrovertible strength of argument, has a noble writer, Lord Lyttleton, adduced the conversion of Saul of Tarsus, and his subsequent conduct, as an irrefragable proof of the truth of Christianity.
Some think that the words, I will show him, etc., refer to a visionary representation, which Christ was immediately to give Saul, of the trials and difficulties which he should have to encounter; as also of that death by which he should seal his testimony to the truth. If so, what a most thorough conviction must Saul have had of the truth of Christianity, cheerfully and deliberately to give up all worldly honors and profits, and go forward in a work which he knew a violent death was to terminate!

For I will (h) shew him how great things he must suffer for my name's sake.
(h) I will plainly show him.

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 detail, 2-Corinthians 11:23 so that Ananias had no reason to be afraid to go to him, and converse with him, and do unto him as he was directed.

I will show him--(See Acts 20:23-24; Acts 21:11).
how great things he must suffer for my name--that is, Much he has done against that Name; but now, when I show him what great things he must suffer for that Name, he shall count it his honor and privilege.

For I - Do thou as thou art commanded. I will take care of the rest; will show him - In fact, through the whole course of his ministry. How great things he must suffer - So far will he be now from persecuting others.