John Wesley on Mark 9:38

And John answered him - As if he had said, But ought we to receive those who follow not us? Master, we saw one casting out devils in thy name - Probably this was one of John the Baptist's disciples, who believed in Jesus, though he did not yet associate with our Lord's disciples. And we forbad him, because he followeth not us - How often is the same temper found in us? How readily do we also lust to envy? But how does that spirit become a disciple, much more a minister of the benevolent Jesus! St. Paul had learnt a better temper, when he rejoiced that Christ was preached, even by those who were his personal enemies. But to confine religion to them that follow us, is a narrowness of spirit which we should avoid and abhor. Lu 9:49.