John Chrysostom
For many believers received gifts, and yet were, not with Christ, such was this man who cast out devils; for there were many of them deficient in some way; some were pure in life, but were not so perfect in faith; others again, contrariwise.
It was not from jealousy or envy, however, that John wished to forbid him who cast out devils, but because he wished that all, who called on the name of the Lord, should follow Christ, and be one body with His disciples. But the Lord, however unworthy they who perform the miracles may be, incites others by their means to believe on Him, and induces themselves by this unspeakable grace to become better. Wherefore there follows: But Jesus said, Forbid him not.
In conformity to this, He shews that he is not to be forbidden, adding immediately after, For there is no man which shall do a miracle in my name, that can lightly speak evil of me. He says lightly, to meet the case of those who fell into heresy, such as were Simon and Menander, and Cerinthusk; not that they did miracles in the name of Christ, but by their deceptions had the appearance of doing them. But these others, though they do not follow us, cannot however set themselves to say any thing against us, because they honour My name by working miracles.
Or else, this is said of those who believe on Him, but nevertheless do not follow Him from the looseness of their lives. Again, it is said of devils, who try to separate all from God, and to disperse His congregation. There follows, For whosoever shall give you a cup of cold water to drink in my name, because ye belong to Christ, verily I say unto you, he shall not lose his reward.
And that no man may allege poverty, He mentions that, of which none can be destitute, that is, a cup of cold water, for which also he will obtain a reward; for it is not the value of the gift, but the dignity of those who receive it, and the feelings of the giver, which makes a work worthy of reward. His words shew that His disciples are to be received, not only on account of the reward, which he who receives them obtains, but also, because he thus saves himself from punishment.
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There follows: And whosoever shall offend one of these little ones that believe in me, it is better for him that a millstone were hanged about his neck, and he were cast into the sea: as though He would say,1 All who honour you for My sake have their reward, so also those who dishonour you, that is, offend you, shall receive the worst of vengeance. Further, from things which are palpable to us, He describes an intolerable torment, making mention of a millstone, and of being drowned; and He says not, let a millstone be hanged about his neck, but, it is better for him to suffer this, shewing by this that some more heavy evil awaits him. But He means by little ones that believe on Me, not only those who follow Him, but those who call upon His name, those also who offer a cup of cold water, though they do not any greater works. Now He will have none of these offended or plucked away; for this is what is meant by forbidding them to call upon His name.