When praise began to be given to Paul and Barnabas for their struggles, Mark was grieved and troubled in soul. He thought, "If I too had been with the apostles, I also would have become a partaker of their glory." Therefore he again wished to accompany them.
Barnabas received him as one who had repented. But Paul insisted that they should not take with them, for the work of the Lord, a man who had not been able to accompany them before.
Thus the disagreement did not have the character of injustice, but of righteousness, and it arose from misunderstanding. Paul demanded righteousness, while Barnabas sought love for mankind.
Though they differed in opinion, they were united in the feeling of piety. They were divided not by faith or conviction, but by a human misunderstanding.
This happened according to God's dispensation. For as soon as they separated, Barnabas took Mark with him and went his own way. Yet Paul's strict exactness also benefited Mark, since by his zeal he sought to wipe away his former fault.
Paul advised the churches not to receive Mark. He did this not to grieve him, but to make him more zealous. When he saw that Mark had shown progress in zeal and had justified himself by his later deeds, he began to approve him and say: "Mark, the cousin of Barnabas, greets you, concerning whom you have received instructions: if he comes to you, receive him" (Col 4:10).
We observe the same thing among the prophets. That is, we observe a difference in opinions and characters. Thus Elijah is strict, while Moses is meek.
So it is here as well. Paul appears more insistent than Mark. But look: at the same time he is also condescending. It is said, "he kept saying," that is, he did not grow heated, but firmly insisted that Mark not be taken.
What then? Did Paul and Barnabas part as enemies? May it never be! In Paul's epistles you find that Barnabas later received much praise from Paul.
It even seems to me that they separated by mutual agreement, saying to one another: since you do not want what I want, and the reverse is also true, let us choose different places for preaching so that we do not quarrel.
This is what they did, each fully yielding to the other. This was written for our instruction, to guard us from falling. For as men, we cannot avoid contentions, but in contentions we must make concessions to one another.
For Mark, however, this contention was as useful as possible. Paul's severity corrected him, while Barnabas' condescension encouraged him not to abandon his calling any further.
Thus Paul and Barnabas dispute, but one result comes from the dispute: benefit. Looking at Paul, who had decided to separate from Barnabas, Mark was greatly frightened and blamed himself. Looking at Barnabas, who so defended him, Mark greatly loved him.
The disciple was corrected by the contention of his teachers. So far was this contention from serving as a stumbling block.