"And some days after Paul said unto Barnabas, Let us go again and visit our brethren in every city where we have preached the word of the Lord, and see how they do. And Barnabas determined to take with them John, whose surname was Mark. But Paul thought not good to take him with them, who departed from them from Pamphylia, and went not with them to the work. And the contention was so sharp between them, that they departed asunder one from the other." And already indeed Luke has described to us the character of the Apostles, that the one was more tender and indulgent, but this one more strict and austere. For the gifts are diverse-(the gifts, I say), for that this is a gift is manifest-but the one befitting one, the other another set of characters, and if they change places, harm results instead of good. In the Prophets too we find this: diverse minds, diverse characters: for instance, Elias austere, Moses meek. So here Paul is more vehement.
And there seems indeed to be exasperation, but in fact the whole matter is a plan of the Divine Providence, that each should receive his proper place: and it behooved that they should not be upon a par, but the one should lead, and the other be led. "And so Barnabas took Mark, and sailed unto Cyprus; and Paul chose Silas, and departed, being recommended by the brethren unto the grace of God. And he went through Syria and Cilicia, confirming the Churches." And this also is a work of Providence. For the Cyprians had exhibited nothing of the like sort as they at Antioch and the rest: and those needed the softer character, but these needed such a character as Paul's.
"And how is it not amiss, that upon so small a matter there should arise so great an evil?" In the first place then, no evil did come of it, if, sufficing each for whole nations, they were divided the one from the other, but a great good. And besides, they would not readily have chosen to leave each other. But admire, I pray you, the writer, how he does not conceal this either. "But at any rate," say you, "if they must needs part, let it be without exasperation." Nay, but if nothing more, observe this, that in this too is shown what was of man (in the preaching of the Gospel). For if the like behooved to be shown (even) in what Christ did, much more here.
And besides, the contention cannot be said to be evil, when each disputes for such objects (as here) and with just reason. I grant you, if the exasperation were in seeking his own, and contending for his own honor, this might well be (reproved): but if wishing, both the one and the other, to instruct and teach, the one took this way and the other that, what is there to find fault with? For in many things they acted upon their human judgment; for they were not stocks or stones. And observe how Paul impeaches (Mark), and gives the reason. For of his exceeding humility he reverenced Barnabas, as having been partner with him in so great works, and being with him: but still he did not so reverence him, as to overlook (what was necessary).
The point to be considered, is not that they differed in their opinions, but that they accommodated themselves the one to the other (seeing), that thus it was a greater good their being parted: and the matter took a pretext from this. What then? did they withdraw in enmity? God forbid! In fact you see after this Barnabas receiving many encomiums from Paul in the Epistles. There was "sharp contention," it says, not enmity nor quarrelling. The contention availed so far as to part them. And with reason: for what each supposed to be profitable, he did not forego thereafter, because of the fellowship with the other. Nay, it seems to me that the parting took place advisedly, and that they said one to another "As I wish not, and thou wishest, therefore that we may not fight, let us distribute the places." So that in fact they did this, altogether yielding each to the other: for Barnabas wished Paul's plan to stand, therefore withdrew; on the other hand, Paul wished the other's plan to stand, therefore he withdrew.
Would to God we too made such separations, as to go forth for preaching. A wonderful man this is; and exceedingly great! To Mark this contest was exceedingly beneficial. For the awe inspired by Paul converted him, while the kindness of Barnabas caused that he was not left behind: so that they contend indeed, but the gain comes to one and the same end. For indeed, seeing Paul choosing to leave him, he would be exceedingly awed, and would condemn himself, and seeing Barnabas so taking his part, he would love him exceedingly: and so the disciple was corrected by the contention of the teachers: so far was he from being offended thereby.
This happens even in the case where God and men are the parties: the man requests, God is wroth. For instance, when He saith, "If her father had spit in her face": and again, "Let me alone, and in Mine anger I will blot out this people." And Samuel when he mourns for Saul. For by both, great good is done. Thus also here: the one is wroth, the other not so. The same happens also in matters where we are concerned. And the sharp contention with good reason, that Mark may receive a lesson, and the affair may not seem mere stage-playing. For it is not to be thought that he who bids, "Let not the sun go down upon your wrath," would have been wroth because of such a matter as this: nor that he who on all occasions gave way would not have given way here, he who so greatly loved Paul that before this he sought him in Tarsus, and brought him to the Apostles, and undertook the alms in common with him, and in common the business relating to the decree.
But Paul insisted that he should not be received. Because, standing on the very forefront of the line, he had stood too tepidly, and rightly, Paul rejected him, lest others be corrupted by his influence as though it were contagion.
[AD 407] John Chrysostom on Acts 15:36-39