First Reading — 2 Samuel 5:1-7, 10
Tertullian
On 5:8
For (here is one of Marcion's antitheses): whereas David long ago, in the capture of Zion, was offended by the blind who opposed his admission (into the stronghold). In this respect (I should rather say) that they were a type of people equally blind, who in later times would not admit Christ to be the son of David. So, on the contrary, Christ helped the blind man to show, by this act, that he was not David's son and how different in disposition he was, by being kind to the blind while David ordered them to be slain. If all this were so, why did Marcion allege that the blind man's faith was of such a worthless type? The fact is, the Son of David acted so that the antithesis must lose its point by its own absurdity. Those persons who offended David were blind, and the man who now presents himself as a beggar to David's son is afflicted with the same infirmity. Therefore the Son of David was appeased with some sort of satisfaction by the blind man when he restored him to sight, and added his approval of the faith which had led him to believe the very truth that he must gain the Son of David's help by earnest entreaty. But, after all, I suspect that it was the audacity (of the old Jebusites) which offended David, and not their malady.
Responsorial Psalm — Psalm 89:20, 21-22, 25-26
Augustine of Hippo
On 88:21
"I have found David My servant:" that David from David's seed: "with My holy oil have I anointed Him" (ver. 20): for it is said of Him, "God, even Thy God, hath anointed Thee with the oil of gladness above Thy fellows."
On 88:21
"My hand shall hold Him fast, and My arm shall strengthen Him" [Psalm 89:21]: because there was a taking up of man; because flesh was assumed in the Virgin's womb, [Luke 1:31] because by Him who in the form of God is coequal with the Father, the form of a servant was taken, and He became obedient unto death, even the death of the Cross. [Philippians 2:6, 8]
On 88:22
"The enemy shall not be able to do him violence" (ver. 22). The enemy rages indeed but he shall not be able to do Him violence: he is wont to hurt, but he shall not hurt. How then shall he afflict Him? he will exercise Him, but he shall not hurt Him. There shall be profit in his raging; for those against whom he rages shall be crowned in their conquering. For how is he conquered, if he rages not against us? or where is God our helper, if we fight not? The enemy therefore shall do what is in his power; but "he shall not be able to do Him violence: the son of wickedness shall not come nigh to hurt Him."
On 88:24
"I will cut in pieces His enemies before His face" [Psalm 89:23]. They are cut in pieces from their conspiracy, and in that they believe they are cut in pieces; for they believe by degrees; as when the calf's head was ground small, they will come to be the drink of God's people. For Moses ground down the calf's head, and sprinkled it upon the water, and made the children of Israel drink it. [Exodus 32:20] All the unbelieving are ground: they believe by degrees; and they are drunk by the people of God, and pass into Christ's body. "I will cut in pieces His foes before His face: and put to flight them that hate Him."
On 88:24
"My truth also and My mercy is with Him" [Psalm 89:24]. All the paths of the Lord are mercy and truth. Remember, as much as you can, how often these two attributes are urged upon us, that we render them back to God. For as He showed us mercy that He might blot out our sins, and truth in fulfilling His promises; so also we, walking in His path, ought to give back to Him mercy and truth; mercy, in pitying the wretched; truth, in not judging unjustly. Let not truth rob you of mercy, nor mercy hinder truth: for if through mercy you shall have judged contrary to truth, or by rigorous truth shall have forgotten mercy, you will not be walking in the path of God, where "mercy and truth meet together." "And in My name shall His horn be exalted." Why should I say more? You are Christians, recognise Christ.
On 88:26
"I will set His hand also in the sea" [Psalm 89:25]: that is, He shall rule over the Gentiles; "and His right hand in the floods." Rivers run into the sea: avaricious men roll onwards into the bitterness of this world: yet all these kinds of men will be subject to Christ.
On 88:26
"He shall call me, You are My Father, and the lifter up of My salvation" [Psalm 89:26].
Gospel — Mark 3:22-30
Augustine of Hippo
On 3:30
(Serm. 71, 12, 21) Or else impenitence itself is the blasphemy against the Holy Ghost which hath no remission. For either in his thought or by his tongue, he speaks a word against the Holy Ghost the forgiver of sins, who treasures up for himself an impenitent heart. But he subjoins, Because they said, He hath an unclean spirit, that he might shew that His reason for saying it, was their declaring that He cast out a devil by Beelzebub, not because there is a blasphemy, which cannot be remitted since even this might be remitted through a right repentance: but the cause why this sentence was put forth by the Lord, after mentioning the unclean spirit, (who as our Lord shews was divided against himself,) was, that the Holy Ghost even makes those whom He brings together undivided, by His remitting those sins, which divided them from Himself, which gift of remission is resisted by no one, but him who has the hardness of an impenitent heart. For in another place, the Jews said of the Lord, that He had a devil, (John 7:20.) without however His saying any thing there about the blasphemy against the Spirit; and the reason is, that they did not there cast in His teeth the unclean spirit, in such a way, that that spirit could by their own words be shewn to be divided against Himself, as Beelzebub was here shewn to be, by their saying, that it might be he who cast out devilso.