5 And whoso shall receive one such little child in my name receiveth me.
[AD 367] Hilary of Poitiers on Matthew 18:1-6
He calls infants all who believe through the hearing of faith; for such follow their father, love their mother, know not to will that which is evil, do not bear hate, or speak lies, trust what is told them, and believe what they hear to be true. But the letter is thus interpreted.

Mystically; The work of the mill is a toil of blindness, for the beasts having their eyes closed are driven round in a circle, and under the type of an ass we often find the Gentiles figured, who are held in the ignorance of blind labour; while the Jews have the path of knowledge set before them in the Law, who if they offend Christ's Apostles it were better for them, that having their necks made fast to a mill-stone, they should be drowned in the sea, that is, kept under labour and in the depths of ignorance, as the Gentiles; for it were better for them that they should have never known Christ, than not to have received the Lord of the Prophets.

[AD 407] John Chrysostom on Matthew 18:1-6
Thus they suffered a human passion, which the Evangelist denotes by saying, At the same time come the disciples to Jesus, saying, Who, we pray thee, is the greatest in the kingdom of heaven? Ashamed to show the feeling which was working within, they do not say openly, Why have you honoured Peter above us? but they ask in general, Who is the greatest? When in the transfiguration they saw three distinguished, namely, Peter, James, and John, they had no such feeling, but now that one is singled out for excesal honour, then they are grieved. But do you remember, first, that it was nothing in this world that they sought; and, secondly, that they afterwards laid aside this feeling? Even their failings are above us, whose enquiry is not, Who is the greatest in the kingdom of heaven? but, Who is greatest in the kingdom of the world?

He chose, I suppose, quite an infant, devoid of any of the passions.

Not only if ye become such yourselves, but also if for My sake you shall pay honour to other such, ye receive reward; and as the return for the honour you pay them, I entail upon you the kingdom. He puts indeed what is far greater, Receiveth me.

And to make this word the rather received. He subjoins a penalty in what follows, Whoso offendeth one of these little ones, & c. as though he had said, As those who for My sake honour one of these, have their reward, so they who dishonour shall undergo the extreme punishment. And marvel not that He calls an evil word an offence, for many of feeble spirit are offended by only being despised,

To correspond with the foregoing, He should have said here, Receiveth not Me, which were bitterer than any punishment; but because they were dull, and the before-named punishment did not move them, by a familiar instance He shows that punishment awaited them; for He therefore says, it were better for him, because another more grievous punishment awaits him.

[AD 407] John Chrysostom on Matthew 18:1-6
The disciples experienced some feeling of human weakness; wherefore the evangelist also adds this note, saying, "In that hour;" when He had preferred him to all. For of James too, and John, one was a firstborn son, but no such thing as this had He done for them.

Then, being ashamed to avow their feeling, they say not indeed openly, "Wherefore hast thou preferred Peter to us?" or, "Is he greater than we are?" for they were ashamed; but indefinitely they ask, "Who then is greater?" For when they saw the three preferred, they felt nothing of the kind; but now that the honor had come round to one, they were vexed. And not for this only, but there were many other things which they put together to kindle that feeling. For to him He had said, "I will give thee the keys;" to him, "Blessed art thou, Simon Barjona;" to him here, "Give unto them for me and thee;" and seeing too in general how freely he was allowed to speak, it somewhat fretted them. And if Mark saith, that they did not ask, but reasoned in themselves, that is nothing contrary to this. For it is likely that they did both the one and the other, and whereas before, on another occasion, they had had this feeling, both once and twice, that now they did both declare it, and reason among themselves.

But to thee I say, "Look not to the charge against them only, but consider this too; first, that they seek none of the things of this world; next, that even this passion they afterwards laid aside, and give up the first place one to another." But we are not able to attain so much as unto their faults, neither do we seek, "who is greatest in the kingdom of heaven;" but, who is greatest in the earthly kingdom, who is wealthiest, who most powerful.

[AD 420] Jerome on Matthew 18:1-6
The disciples seeing one piece of money paid both for Peter and the Lord, conceived from this equality of ransom that Peter was preferred before all the rest of the Apostles.

Jesus seeing their thoughts would heal their ambitious strivings, by arousing an emulation in lowliness; whence it follows, And Jesus calling a little child, set him in the midst of them.

One whose tender age should express to them the innocence which they should have. But truly He set Himself in the midst of them, a little one who had come not to be ministered unto, but to minister; (Mat. 20:28.) that He might be a pattern of holiness. Others interpret the little one of the Holy Spirit, whom He set in the hearts of His disciples, to change their pride into humility. (Vid. Origen. in loc.) And he said. Verily I say unto you, Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven. He does not enjoin on the Apostles the age, but the innocence of infants, which they have by virtue of their years, but to which these might attain by striving; that they should be children in malice, not in understanding. As though He had said, As this child, whom I set before you as a pattern, is not obstinate in anger, when injured does not bear it in mind, has no emotion at the sight of a fair woman, does not think one thing while he speaks another; so ye, unless ye have the like innocence and purity of mind, shall not be able to enter into the kingdom of heaven.

Or otherwise; Whoso shall humble himself as this little child, that is, whoso shall humble himself after My example, he shall enter into the kingdom of heaven. It follows, And whoso receiveth one such little one in my name, receiveth me.

For whoever is such that he imitates Christ's humility and innocence, Christ is received by him; and by way of caution, that the Apostles should not think, when such are come to them, that it is to themselves that the honour is paid, He adds, that they are to be received not for their own desert, but in honour of their Master.

Observe that he who is offended is a little one, for the greater hearts do not take offences. And though it may be a general declaration against all who scandalize any, yet from the connection of the discourse it may be said specially to the Apostles; for in asking who should be greatest in the kingdom of heaven, they seemed to be contending for preeminence among themselves; and if they had persisted in this fault, they might have scandalized those whom they called to the faith, seeing the Apostles contending among themselves for the preference.

When it is said, It is better for him that a mill-stone be hanged about his neck, He speaks according to the custom of the province; for among the Jews this was the punishment of the greater criminals, to drown them by a stone tied to them. It is better for him, because it is far better to receive a brief punishment for a fault, than to be reserved for eternal torments.

[AD 430] Augustine of Hippo on Matthew 18:1-6
(Quæst. Ev. i. 24) Otherwise; Whoso offendeth one of these little ones, that is so humble as He would have his disciples to be, by not obeying, or by opposing, (as the Apostle says of Alexander,) it were better for him, that a millstone should be hanged about his neck, and he be drowned in the depths of the sea, (2 Tim. 4:15.) that is, it were better for him that desire of the things of the world, to which the blind and foolish are tied down, should sink him by its load to destruction.

[AD 533] Remigius of Rheims on Matthew 18:1-6
In the understanding of grace, or in ecclesiastical dignity, or at least in everlasting blessedness.

[AD 604] Gregory the Dialogist on Matthew 18:1-6
(Mor. vi. 37.) Otherwise; What is denoted by the sea, but the world, and what by the mill-stone, but earthly action? which, when it binds the neck in the yoke of vain desires, sends it to a dull round of toil. There arc some who leave earthly action, and bond themselves to aims of contemplation beyond the reach of intellect, laying aside humility, and so not only throw themselves into error, but also cast many weak ones out of the bosom of truth. Whoso then offends one of the least of mine, it were better for him that a mill-stone be tied about his neck, and he be cast into the sea; that is, it were better for a perverted heart to be entirely occupied with worldly business, than to be at leisure for contemplative studies to the hurt of many.

[AD 1274] Glossa Ordinaria on Matthew 18:1-6
(interlin.) Except ye be converted from this ambition and jealousy in which you are at present, and become all of you as innocent and humble in disposition as you are weak, in your years, ye shall not enter into the kingdom of heaven; and since there is none other road to enter in, whoso shall humble himself as this little child, the same is greatest in the kingdom of heaven; for by how much a man is humble now, by so much shall he be exalted in the kingdom of heaven.

[AD 253] Origen of Alexandria on Matthew 18:5-6
But how can he who has been converted, and become as a little child, be yet liable to be scandalized? This may be thus explained. Every one who believes on the Son of God, and walks after evangelic acts, is converted and walks as a little child; but he who is not converted that he may become as a child, it is impossible that he should enter into the kingdom of heaven. But in every congregation of believers, there are some only newly converted that they may become as little children, but not yet made such; these are the little ones in Christ, and these are they that receive offence.

[AD 407] John Chrysostom on Matthew 18:5
Wherefore He brought it in, and set it in the midst; and not at this merely did He conclude His discourse, but carries further this admonition, saying, "And whoso shall receive such a little child in my name, receiveth me."

"For know," saith He, "that not only, if ye yourselves become like this, shall ye receive a great reward; but also if for my sake ye honor others who are such, even for your honor to them do I appoint unto you a kingdom as your recompence." Or rather, He sets down what is far greater, saying, "he receiveth me." So exceedingly dear to me is all that is lowly and artless. For by "a little child," here, He means the men that are thus simple and lowly, and abject and contemptible in the judgment of the common sort.

[AD 420] Jerome on Matthew 18:5
Whoever receives one such child in my name receives me. Whoever lives so as to imitate Christ’s humility and innocence, in him Christ is taken up. And he is careful to add—so that when the apostles heard of it, they would not think that they had been honored—that they would not be taken up for their merit but for the honor of the master.

[AD 420] Jerome on Matthew 18:5
(Verse 5.) And whoever receives such a little child in my name, receives me. And whoever is such, that he imitates the humility and innocence of Christ, in him Christ is received. And wisely, lest when it is reported to the apostles, they should think themselves honored, he added that they should be received not through their own merit, but through the honor of the master.

[AD 510] Epiphanius Scholasticus on Matthew 18:5
Here the Lord not only repressed the apostles’ thoughts but also checked the ambition of believers throughout the whole world, so that he might be great who wanted to be least. For with this purpose Jesus used the example of the child, that what he had been through his nature, we through our holy living might become—innocent, like children innocent of every sin. For a child does not know how to hold resentment or to grow angry. He does not know how to repay evil for evil. He does not think base thoughts. He does not commit adultery or arson or murder. He is utterly ignorant of theft or brawling or all the things that will draw him to sin. He does not know how to disparage, how to blaspheme, how to hurt, how to lie. He believes what he hears. What he is ordered he does not analyze. He loves his parents with full affection. Therefore what children are in their simplicity, let us become through a holy way of life, as children innocent of sin. And quite rightly, one who has become a child innocent of sin in this way is greater in the kingdom of heaven. And whoever receives such a person will receive Christ.