Acts 15:36

"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 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).

If it seemed necessary to the apostles to travel around, and to return often to the same cities where they had preached the gospel, and to visit the believers and to examine closely how they were, what justification will we have before God if we do not fulfill through our writings what they fulfilled by traveling with great toil on their feet and going spontaneously to those who were in need and teaching what is useful for salvation?

It should be noted that it was the duty of leaders to care for those whom they had enlightened with the light of the Gospel — to examine whether they were sound in faith, whether they were faltering, and whether they needed to be corrected.