First Reading — Isaiah 48:17-19
Ambrose of Milan
On 48:18
Set before yourself any river. It springs from its fountain but is of one nature, of one brightness and beauty. And you assert rightly that the Holy Spirit is of one substance, brightness and glory with the Son of God and with God the Father. I will sum up everything in the oneness of the qualities without any dispute over degrees of greatness. For in this point also Scripture has provided for us. For the Son of God says, "Whoever shall drink of the water that I will give him, it shall become in him a well of water springing up unto everlasting life." This well is clearly the grace of the Spirit, a stream proceeding from the living Fountain. The Holy Spirit, then, is also the fountain of eternal life.You observe, then, from his words that the unity of the divine greatness is pointed out and that Christ cannot be denied to be a fountain even by heretics, since the Spirit, too, is called a fountain. The Spirit is called a river, too, just as the Father said, "Behold, I come down on you like a river of peace, and like a stream overflowing the glory of the Gentiles." And who can doubt that the Son of God is the river of life from whom the streams of eternal life flowed forth?
On 48:18
This water is good, then. I mean here the grace of the Spirit. Who will give this Fountain to my heart? Let it spring up in me, let that which gives eternal life flow on me. Let that Fountain overflow on us and not flow away. For Wisdom says, "Drink water out of your own vessels and from the fountains of your own wells, and let your waters flow abroad in your streets." How shall I keep this water so that it does not seep out or glide away? How shall I preserve my vessel, lest any crack of sin penetrating it should let the water of eternal life exude? Teach us, Lord Jesus, teach us as you taught your apostles, saying, "Lay not up for yourselves treasures on the earth, where rust and moth destroy and where thieves break through and steal."8Our rust is wantonness, our rust is lust, our rust is luxury, which dim the keen vision of the mind with the filth of vices. Again, our moth is Arius, our moth is Photinus, who rend the holy vesture of the church with their impiety, and desiring to separate the indivisible unity of the divine power, gnaw the precious veil of faith with sacrilegious tooth. The water is spillled if Arius has imprinted his tooth, it flows away if Photinus has planted his sting in anyone's vessel.…
If you seek Jesus, forsake the broken cisterns, for Christ did not make it his custom to sit by a pool but by a well. There that Samaritan woman found him, she who believed, she who wished to draw water. Although you ought to have come in early morning, nevertheless if you come later, even at the sixth hour, you will find Jesus wearied with his journey. He is weary, but it is because of you, because he has long looked for you, your unbelief has long wearied him. Yet he is not offended if you only come now. He asks to drink who is about to give. But he drinks not the water of a stream flowing by, but your salvation. He drinks your good dispositions. He drinks the cup, that is, the passion that atoned for your sins, that you, drinking of his sacred blood, might quench the thirst of this world.
Responsorial Psalm — Psalm 1:1-2, 3, 4 and 6
Clement of Alexandria
On 1:1
And "the chair of pestilences" will be the theaters and tribunals, or rather the compliance with wicked and deadly powers and complicity with their deeds.
Gospel — Matthew 11:16-19
Hilary of Poitiers
On 11:16
The whole of this speech is a reproach of unbelief, and arises out of the foregoing complaint; that the stiff-necked people had not learned by two different modes of teaching.
On 11:16
By the children are meant the Prophets, who preached as children in singleness of meaning, and in the midst of the synagogue, that is in the market-place, reprove them, that when they played to those to whom they had devoted the service of their body, they had not obeyed their words, as the movement of the dancers are regulated by the measures of the music. For the Prophets invited them to make confession by song to God, as it is contained in the song of Moses, of Isaiah, or of David.
On 11:16
He is wisdom itself not by His acts, but by His nature. Many indeed evade that saying of the Apostle’s, Christ is the wisdom and power of God, (1 Cor. 1:24) by saying, that truly in creating Him of a Virgin the Wisdom and Power of God were shewn mightily. (e.g. Paul of Samosata, &c.) Therefore that this might not be so explained, He calls Himself the Wisdom of God, shewing that it was verily He, and not the deeds relating to Him, of whom this was meant. For the power itself, and the effect of that power, are not the same thing; the efficient is known from the act.
On 11:19
Mystically; Neither did the preaching of John bend the Jews, to whom the law seemed burdensome in prescribing meats and drinks, difficult and grievous, having in it sin which He calls having a dæmon—for from the difficulty of keeping it they must sin under the Law. Nor again did the preaching of the Gospel with freedom of life in Christ please them—by which the hardships and burdens of the Law were remitted, and publicans and sinners only believed in it. Thus, then, so many and so great warnings of all kinds having been offered them in vain, they are neither justified by the Law, and they are cast off from grace; Wisdom, therefore, is justified of her children, by those, that is, who seize the kingdom of heaven by the justification of faith, confessing the work of wisdom to be just, that it has transferred its gift from the rebellious to the faithful.