John Wesley on Acts 15:39

And there was a sharp contention - Literally, a paroxysm, or fit of a fever. But nothing in the text implies that the sharpness was on both sides. It is far more probable that it was not; that St. Paul, who had the right on his side, as he undoubtedly had,) maintained it with love. And Barnabas taking Mark with him, sailed away to Cyprus - Forsaking the work in which he was engaged, he went away to his own country.