First Reading — Isaiah 49:8-15
Ambrose of Milan
On 49:9
[When] we have changed our creditor, we have not entirely escaped, or, rather, we have escaped, but the debt remains, while the interest is canceled, the Lord Jesus saying, "To them that are bound, come forth. And to them that are in prison, go forth," for your sins have been forgiven. He has forgiven all, and there is no one whom he has not set free.
Responsorial Psalm — Psalm 145:8-9, 13cd-14, 17-18
Gregory of Nyssa
On 144:16
A person, then, who remains the same and yet babbles to himself about the change for the better he has undergone in baptism should attend to what Paul says: "If anyone thinks he is something when he is nothing, he deceives himself." For you are not what you have not become; whereas the gospel says of the regenerate that "he gave all those who received him the power to become God's children." Now the child born of someone certainly shares his parent's nature. If, then, you have received God and become his child, let your way of life testify to the God within you; make it clear who your Father is! The marks by which we recognize God are the very ones by which a son of his must show his relation to him: "he opens his hand and fills everything living with joy"; "he overlooks iniquity"; "he relents of his evil purpose";29 "the Lord is kind to all and is not angry with us every day"; "God is straightforward, and there is no unrighteousness in him"31—and the similar sayings scattered through Scripture for our instruction. If you are like this, you have genuinely become a child of God. But if you persist in displaying the marks of evil, it is useless to babble to yourself about the birth from above. Prophecy will tell you, "You are a son of humankind, not a son of the most High. You love vanity and seek lies. You fail to realize that the only way one is magnified is by becoming holy."
Gospel — John 5:17-30
Hilary of Poitiers
On 5:19
(vii. de Trin. c. 17) He refers to the charge of violating the sabbath, brought against Him. My Father worketh hitherto, and I work; meaning that He had a precedent for claiming the right He did; and that what He did was in reality His Father’s doing, who acted in the Son. And to quiet the jealousy which had been raised, because by the use of His Father’s name He had made Himself equal with God, and to assert the excellency of His birth and nature, He says, Verily, verily, I say unto you, The Son can do nothing of Himself, but what He seeth the Father do.
On 5:19
(vii. de Tr. c. 17.) Lest then that assertion of His equality, which must belong to Him, as by Name and Nature the Son, might throw doubt upon His Nativityf, He says that the Son can do nothing of Himself.
On 5:19
(vii. de Tr. c. 17) That the wholesome order of our confession, i. e. that we believe in the Father and the Son, might remain, He shews the nature of His birth; viz. that He derived the power of acting not from an accession of strength supplied for each work, but by His own knowledge in the first instance. And this knowledge He derived not from any particular visible precedents, as if what the Father had done, the Son could do afterwards; but that the Son being born of the Father, and consequently conscious of the Father’s virtue and nature within Him, could do nothing but what He saw the Father do: as he here testifies; God does not see by bodily organs, but by the virtue of His nature.
On 5:19
(vii. de Tr. c. 18) Or thus; All things and the same, He says, to shew the virtue of His nature, its being the same with God’s. That is the same nature, which can do all the same things. And as the Son does all the same things in a like way, the likeness of the works excludes the notion of the worker existing aloneg. Thus we come to a true idea of the Nativity, as our faith receives it: the likeness of the works bearing witness to the Nativity, their sameness to the Nature.
On 5:19
(vii. de Trin. c. 19) It must not be supposed that the Only Begotten God needed such shewing on account of ignorance. For the shewing here is only the doctrine of the nativityh; the self-existing Son, from the self-existing Father.
On 5:19
(vii. de Trin. c. 19) Nor did the heavenly discourse lack the caution, to guard against our inferring from these words any difference in the nature of the Son and the Father. For He says that the works of the Father were shewn to Him, not that strength was supplied Him for the doing of them, in order to teach that this shewing is substantially nothing else than His birth; for that simultaneously with the Son Himself is born the Son’s knowledge of the works the Father will do through Him.
On 5:21
(de Trin. vii. c. 19) For to will is the free power of a nature, which by the act of choice, resteth in the blessedness of perfect excellence.
On 5:22
(de Trin vii. c. 20) Having said that the Son quickeneth whom He will, in order that we might not lose sight of the nativity, and think that He stood upon the ground of His own unborn power, He immediately adds, For the Father judgeth no man, but hath given all judgment unto the Son. In that all judgment is given to Him, both His nature, and His nativity are shewn; because only a self-existent nature can possess all things, and nativity cannot have any thing, except what is given it.
On 5:23
(vii. de Trin. c. 20) All judgment is given to Him, because He quickens whom He will. Nor can the judgment be looked on as taken away from the Father, inasmuch as the cause of His not judging is, that the judgment of the Son is His. For all judgment is given from the Father. And the reason for which He gives it, appears immediately after: That all men may honour the Son even as they honour the Father.
On 5:23
(vii. de Trin. c. 21) The conclusion then stands good against all the fury of heretical minds. He is the Son, because He does nothing of Himself: He is God, because, whatsoever things the Father doeth, He doeth the same; They are one, because They are equal in honour: He is not the Father, because He is sent.
On 5:25
(vii. de Trin. c. 27, 28) Living born from living, hath the perfection of nativity, without the newness of nature. For there is nothing new implied in generation from living to living, the life not coming at its birth from nothing. And the life which derives its birth from life, must by the unity of nature, and the sacrament of a perfect birth, both be in the living being, and have the being who lives it, in itself. Weak human nature indeed is made up of unequal elements, and brought to life out of inanimate matter; nor does the human offspring live for some time after it is begotten. Neither does it wholly live from life, since much grows up in it insensibly, and decays insensibly. But in the case of God, the whole of what He is, lives: for God is life, and from life, can nothing be but what is living.
On 5:25
For the person of the receiver, is distinct from that of the giver: it being inconceivable that one and the same person, should give to and receive from Himself. He who lives of Himself is one person: He who acknowledges an Author of His life is another.
On 5:26
The heretics, driven hard by Scripture proofs, are obliged to attribute to the Son at any rate a likeness, in respect of virtue, to the Father. But they do not admit a likeness of nature, not being able to see that a likeness of virtue, could not arise but from a likeness of nature; as an inferior nature can never attain to the virtue of a higher and better one. And it cannot be denied that the Son of God has the same virtue with the Father, when He says, What things soever (the Father) doeth, the same doeth the Son likewise. But an express mention of the likeness of nature follows: As the Father hath life in Himself, so hath He given to the Son to have life in Himself. In life are comprehended nature and essence. And the Son, as He hath it, so hath He it given to Him. For the same which is life in both, is essence in both; and the life, i. e. essence, which is begotten from life, is born; though not born unlike the other. For, being life from life, it remains like in nature to its origin.