First Reading — Deuteronomy 31:1-8
Augustine of Hippo
On 31:6
Pay attention to what comes next: "Without love, a measure of money is sufficient for present needs, because he himself said, 'I will not forsake you; I will not desert you.' " "You were afraid of all kinds of evils, against which you were saving money; count me as your guarantor." That's what God says to you. God—not a man, not your equal or you yourself—says to you: "I will not forsake you; I will not desert you." If a person made such a promise, you would trust him. God makes it, and you hesitate? He made the promise, put it in writing, made out the bond; you needn't worry at all.
Responsorial Psalm — Deuteronomy 32:3-4ab, 7, 8, 9 and 12
Clement of Alexandria
On 32:8
This is he who bestows on the Greeks also their philosophy through the inferior angels. For by an ancient and divine ordinance angels are assigned to the different nations. But to be the Lord's portion is the glory of believers.
On 32:10
As far as I can see, Scripture is undoubtedly presenting a picture of the educator of children and describing the guidance he imparts.
Gospel — Matthew 18:1-5, 10, 12-14
Origen
On 18:1
Herein we ought to be imitators of the disciples, that when any question of doubt arises among us, and we find not how to settle it, We should with one consent go to Jesus, Who is able to enlighten the hearts of men to the explication of every perplexity. We shall also consult some of the doctors, who are thought most eminent in the Churches. But in that they asked this question, the disciples knew that there was not an equality among the saints in the kingdom of heaven; what they yet sought to learn was, how they were so, and lived as greater and less. Or, from what the Lord had said above, they knew Who was the best and who was great; but out of many great, who was the greatest, this Was not clear to them.
On 18:3
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.
On 18:7
This we may understand not of the material elements of the world; but here the men who are in the world, are called the worlda. But Christ’s disciples are not of this world, whence there cannot be woe to them from offences; for though there be many offences, they do not touch him who is not of this world. But if he be yet of this world in loving the world, and the things in it, as many offences will seize him as those by which he was encompassed in the world. It follows, For it must needs be that offences come.
On 18:7
Or; The scandals that are to come are the Angels of Satan. But do not look that these offences should shew themselves in a substantial or natural shape, for in some the freedom of the will has been the origin of offence, not liking to undergo toil for virtue’s sake. But there cannot be real good, without the opposition of evil. It must needs be then that offences come, as it must needs be that we encounter the evil assaults of spiritual powers; whose hatred is the more stirred up, as Christ’s word invading men drives out the evil influences from them. And they seek instruments by whom the offences may the rather work; and to such instruments is more woe; for him who gives, it shall be worse than for him who takes, the offence, as it follows, But woe unto that man by whom the offence cometh.
On 18:7
Or, The priests may with good reason be called the eyes of the Church, since they are considered her watchmen, but the deacons and the rest her hands, for by them spiritual deeds are wrought; the people are the feet of the body, the Church; and all these it behoves not to spare, if they become an offence to the Church. Or, by the offending hand is understood an act of the mind; a motion of the mind is the offending foot, and a vision of the mind is the sinning eye, which we ought to cut off if they give offence, for thus the acts of the limbs are often put in Scripture for the limbs themselves.
On 18:10
The little ones are those that are but lately born in Christ, or those who abide without advance, as though lately born. But Christ judged it needless to give command concerning not despising the more perfect believers, but concerning the little ones, as He had said above, If any man shall offend one of these little ones. A man may perhaps say that a little one here means a perfect Christian, according to that He says elsewhere, Whoso is least among you, he shall be great. (Luke 9:48.)
On 18:10
Some will have it that an Angel is given as an attendant minister from the time when in the laver of regeneration the infant is born in Christ; for, say they, it is incredible that a holy Angel watches over those who are unbelieving and in error, but in his time of unbelief and sin man is under the Angels of Satan. Others will have it, that those who are foreknown of God, have straightway from their very birth a guardian Angel.
On 18:14
But this exposition does not seem to agree with that which was said, If any one scandalizes one of these little ones; for the perfect man is not scandalized, nor does he perish. But he who thinks this the true exposition, says, that the mind of a righteous man is variable, and is sometimes offended, but not easily.