First Reading — Isaiah 42:1-4, 6-7
Irenaeus
On 42:3
The prophets, therefore, did not openly behold the actual face of God, but [they saw] the dispensations and the mysteries through which man should afterwards see God. As was also said to Elias: "Thou shalt go forth tomorrow, and stand in the presence of the Lord; and, behold, a wind great and strong, which shall rend the mountains, and break the rocks in pieces before the Lord. And the Lord [was] not in the wind; and after the wind an earthquake, but the Lord [was] not in the earthquake; and after the earthquake a fire, but the Lord [was] not in the fire; and after the fire a scarcely audible voice" (vox aurae tenuis). For by such means was the prophet-very indignant, because of the transgression of the people and the slaughter of the prophets-both taught to act in a more gentle manner; and the Lord's advent as a man was pointed out, that it should be subsequent to that law which was given by Moses, mild and tranquil, in which He would neither break the bruised reed, nor quench the smoking flax. The mild and peaceful repose of His kingdom was indicated likewise. For, after the wind which rends the mountains, and after the earthquake, and after the fire, come the tranquil and peaceful times of His kingdom, in which the spirit of God does, in the most gentle manner, vivify and increase mankind.
On 42:5
For the breath of life, which also rendered man an animated being, is one thing, and the vivifying Spirit another, which also caused him to become spiritual. And for this reason Isaiah said, "Thus saith the Lord, who made heaven and established it, who founded the earth and the things therein, and gave breath to the people upon it, and Spirit to those walking upon it;" thus telling us that breath is indeed given in common to all people upon earth, but that the Spirit is theirs alone who tread down earthly desires. And therefore Isaiah himself, distinguishing the things already mentioned, again exclaims, "For the Spirit shall go forth from Me, and I have made every breath." Thus does he attribute the Spirit as peculiar to God which in the last times He pours forth upon the human race by the adoption of sons; but [he shows] that breath was common throughout the creation, and points it out as something created. Now what has been made is a different thing from him who makes it. The breath, then, is temporal, but the Spirit eternal. The breath, too, increases [in strength] for a short period, and continues for a certain time; after that it takes its departure, leaving its former abode destitute of breath. But when the Spirit pervades the man within and without, inasmuch as it continues there, it never leaves him.
Responsorial Psalm — Psalm 29:1-2, 3-4, 3, 9-10
Athanasius of Alexandria
On 28:2
He commands us to worship the Lord in his holy court, teaching that it is not allowed to worship outside the church which holds the orthodox faith.
On 28:10
God dwells in the flood, that is, in the multitude of those who believed in Christ, who [as it says in the next verse] gives power to his people and blesses it in peace. For we are strengthened in Christ, who also gave us his peace.
Second Reading — Acts 10:34-38
Irenaeus
On 10:35
...to whom Peter, coming in, said, "Of a truth I perceive that God is no respecter of persons: but in every nation, he that feareth Him, and worketh righteousness, is acceptable to Him." He thus clearly indicates, that He whom Cornelius had previously feared as God, of whom he had heard through the law and the prophets, for whose sake also he used to give alms, is, in truth, God. The knowledge of the Son was, however, wanting to him...
On 10:37
He thus clearly indicates, that He whom Cornelius had previously feared as God, of whom he had heard through the law and the prophets, for whose sake also he used to give alms, is, in truth, God. The knowledge of the Son was, however, wanting to him; therefore did [Peter] add, "The word, ye know, which was published throughout all Judea, beginning from Galilee, after the baptism which John preached, Jesus of Nazareth, how God anointed Him with the Holy Ghost, and with power; who went about doing good, and healing all that were oppressed of the devil; for God was with Him. And we are witnesses of all those things which He did both in the land of the Jews and in Jerusalem; whom they slew, hanging Him on a beam of wood: Him God raised up the third day, and showed Him openly; not to all the people, but unto us, witnesses chosen before of God, who did eat and drink with Him after the resurrection from the dead. And He commanded us to preach unto the people, and to testify that it is He which was ordained of God to be the Judge of quick and dead. To Him give all the prophets witness, that, through His name, every one that believeth in Him does receive remission of sins." The apostles, therefore, did preach the Son of God, of whom men were ignorant; and His advent, to those who had been already instructed as to God; but they did not bring in another god.
Gospel — Luke 3:15-16, 21-22
Origen
On 3:15
It was meet that more deference should be paid to John than to other men, for he lived such as no other man. Wherefore indeed most rightly did they regard him with affection, only they kept not within due bounds; hence it is said, But while the people were expecting whether he were the Christ.
On 3:15
But love is dangerous when it is uncontrolled. For he who loves any one ought to consider the nature and causes of loving, and not to love more than the object deserves. For if he pass the due measure and bounds of love, both he who loves, and he who is loved, will be in sin.
On 3:15
And as John was waiting by the river Jordan for those who came to his baptism, and some he drove away, saying, Generation of vipers, but those who confessed their sins he received, so shall the Lord Jesus stand in the fiery stream with the flaming sword, that whoever after the close of this life desires to pass over to Paradise and needs purification, He may baptize him with this laver, and pass him over to paradise, but whoso has not the seal of the former baptisms, him He shall not baptize with the laver of fire.
On 3:17
Or, because without the wind the wheat and chaff cannot be separated, therefore He has the fan in His hand, which shews some to be chaff, some wheat; for when you were as the light chaff; (i. e. unbelieving,) temptation shewed you to be what you knew not; but when you shall bravely endure temptation, the temptation will not make you faithful and enduring, but it will bring to light the virtue which was hid in you.
On 3:18
John having announced the coming of Christ, was preaching the baptism of the Holy Spirit, and the other things which the Gospel history has handed down to us. But besides these he is declared to have announced others in the following words, And many other things in his exhortation preached he unto the people.
On 3:19
And as in the Gospel according to St. John it is related of Christ that He spoke many other things, so also in this place we must understand Luke to say the same of John the Baptist, since certain things are announced by John too great to be entrusted to writing. But we marvel at John, because among them that are born of women there was not a greater than he, for by his good deeds he had been exalted to so high a fame for virtue, that by many he was supposed to be Christ. But what is much more marvellous he feared not Herod, nor dreaded death, as it follows, But Herod the tetrarch being reproved by him.