Mark 9:4040For he that is not against us is on our part. (Mark 9:40) was a rebuke to John's jealousy over someone doing miracles that he may have failed to do. and because it took away some of the reputation of his company.
“Now if any man have not the Spirit of Christ, he is not of him." (This is the true rendering.)
Ans. The call to "My people" in chap. 18:4 is primarily to those who are the converted ones in that day, that is: after the saints of this day are caught up to be with the Lord. There are others, both of Jews and Gentiles that own the name of Jesus and the Word of God (6:9; 7; 14:12), and these are warned to "come out of her." The warning should be also useful to saints now to come out from all the babel of men's arrangements and systems that are not in the Word of God, and are contrary to it.