9:39 Forbid him not. He neither praises nor blames him for following an independent course, and not working with his disciples. He simply declares that he must not be forbidden, and that those who work the same kind of work that we do should be regarded not as enemies, but allies. Thousands, in every period of church history, have spent their lives in copying John's mistake. They have labored to stop every man who will not work for Christ in their way from working for Christ at all (Ryle).
9:39 Jesus said - Christ here gives us a lovely example of candour and moderation. He was willing to put the best construction on doubtful cases, and to treat as friends those who were not avowed enemies. Perhaps in this instance it was a means of conquering the remainder of prejudice, and perfecting what was wanting in the faith and obedience of these persons. Forbid him not - Neither directly nor indirectly discourage or hinder any man who brings sinners from the power of Satan to God, because he followeth not us, in opinions, modes of worship, or any thing else which does not affect the essence of religion.
9:30-40 The time of Christ's suffering drew nigh. Had he been delivered into the hands of devils, and they had done this, it had not been so strange; but that men should thus shamefully treat the Son of man, who came to redeem and save them, is wonderful. Still observe that when Christ spake of his death, he always spake of his resurrection, which took the reproach of it from himself, and should have taken the grief of it from his disciples. Many remain ignorant because they are ashamed to inquire. Alas! that while the Saviour teaches so plainly the things which belong to his love and grace, men are so blinded that they understand not his sayings. We shall be called to account about our discourses, and to account for our disputes, especially about being greater than others. Those who are most humble and self-denying, most resemble Christ, and shall be most tenderly owned by him. This Jesus taught them by a sign; whoever shall receive one like this child, receives me. Many have been like the disciples, ready to silence men who have success in preaching to sinners repentance in Christ's name, because they follow not with them. Our Lord blamed the apostles, reminding them that he who wrought miracles in his name would not be likely to hurt his cause. If sinners are brought to repent, to believe in the Saviour, and to live sober, righteous, and godly lives, we then see that the Lord works by the preacher.
