Mark 9:42

He did not shrink from using the same words three times over in one passage. And who is not terrified by this repetition and by the threat of that punishment uttered so vehemently by the lips of the Lord himself?

(Vict. Ant. e Cat. in Marc.) His words show 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. 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, 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, showing 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.

(in Ezech. 1. Hom. 7) We must observe, however, that in our good works we must sometimes avoid the offence of our neighbour, sometimes look down upon it as of no moment. For in as far as we can do it without sin, we ought to avoid the offence of our neighbour; but if a stumblingblock is laid before men in what concerns the truth, it is better to allow the offence to arise, than that the truth should be abandoned. (de cura past. p. i. c. 2) Mystically by a millstone is expressed the tedious round and toil of a secular life, and by the depths of the sea, the worst damnation is pointed out. He who therefore, after having been brought to a profession of sanctity, destroys others, either by word or example, it had been indeed better for him that his worldly deeds should render him liable to death, under a secular garb, than that his holy office should hold him out as an example for others in his faults, because doubtless if he had fallen alone, his pain in hell would have been of a more endurable kind.

(ubi sup.) And fitly the man who is offended is called a little one, for he who is great, whatever he may suffer, departs not from the faith; but he who is little and weak in mind looks out for occasions of stumbling. For this reason we must most of all look to those who are little ones in the faith, lest by our fault they should be offended, and go back from the faith, and fall away from salvation.

Not only will I not forbid him who works miracles in My name, but also whosoever shall give you the smallest thing for My name's sake, and shall receive you, not on account of human and worldly favour, but from love to Me, shall not lose his reward.