First Reading — James 4:13-17
John Chrysostom
On 4:15
James is not trying to take away our freedom to decide, but he is showing us that it is not just what we want that matters. We need God's grace to complement our efforts and ought to rely not on them but on God's love for us. As it says in Proverbs: "Do not boast about tomorrow, for you do not know what a day may bring forth."
On 4:17
James does not remove the power to do good, but he shows that it is not just a matter of one's own will. To do good as we ought, we need the grace of God.
Responsorial Psalm — Psalm 49:2-3, 6-7, 8-10, 11
Basil of Caesarea
On 48:2
He who is assembling and summoning all by the proclamation is the Paraclete, the Spirit of truth, who brings together through prophets and apostles those who are saved.… The sharing of the summons is a uniting in peace, so that those who were, up to this time, opposed to each other because of customs might, through gathering together, become habituated to each other in love.
On 48:5
The things that I teach, he says, from the Spirit, these I proclaim to you, saying nothing of my own, nothing human; but, since I have been listening to the propositions of the Spirit, who hands down in mystery to us the wisdom of God, I am opening for you and am making manifest the proposition; moreover, I am opening not otherwise than through psaltery. The psaltery is a musical instrument that gives out its sounds harmoniously with the melody of the voice. Accordingly, the rational psaltery is opened especially at that time when actions in harmony with the words are displayed. And he is a spiritual psaltery who has acted and has taught. He it is who opens the proposition in the psalms, setting forth the possibility of the teaching from his own example.… There is nothing incongruous or out of tune in his life.
On 48:6
Even if he seems to be one of the very powerful people in this life, even if he is surrounded with a great number of possessions, these words teach him to descend from such a notion and to humble himself under the mighty hand of God. … Not even the soul is complete in itself for salvation.… Every human soul has bowed down under the evil yoke of slavery imposed by the common enemy of all and, being deprived of the very freedom that it received from the Creator, has been led captive through sin. Every captive has need of ransoms for his freedom. Now, neither a brother can ransom his brother, nor can anyone ransom himself, because he who is ransoming must be much better than he who has been overcome and is now a slave. But, actually, no one has the power with respect to God to make atonement for a sinner, since he himself is liable for sin. "All have sinned and have need of the glory of God. They are justified freely by his grace through the redemption that is in Christ Jesus" our Lord.
On 48:8
In fact, what can one find great enough that he may give it for the ransom of his soul? But one thing was found worth as much as all people together. This was given for the price of ransom for our souls, the holy and highly honored blood of our Lord Jesus Christ, which he poured out for all of us; therefore, we were bought at a great price. If, then, a brother does not redeem, will a man redeem? But if man cannot redeem us, he who redeems us is not a man. Now, do not assume, because he sojourned with us "in the likeness of sinful flesh," that our Lord is only man, failing to discern the power of the divinity, who had no need to give God a ransom for himself or to redeem his own soul because "he did no sin, neither was deceit found in his mouth." No one is sufficient to redeem himself, unless he comes who turns away the captivity of the people, not with ransoms or with gifts, as it is written in Isaiah, but in his own blood.… He does not need a ransom, but he himself is the propitiation.
Gospel — Mark 9:38-40
Augustine of Hippo
On 9:38
(de Con. Evan. 4. 5.) We must take care that this saying of the Lord appear not to be contrary to that, where He says, He who is not with me is against me. (Luke 11:23) Or will any one say that the difference lies in that here He says to His disciples, For he that is not against you is on your part, but in the other He speaks of Himself, He who is not with me is against me? As if indeed it were possiblel that he who is joined to Christ’s disciples, who are as His members, should not be with Him. How if it were so, could it be true that he that receiveth you receiveth me? (Matt. 10:40) Or how is he not against Him, who is against His disciples? Where then will be that saying, He who despiseth you, despiseth me? But surely what is implied is, that a man is not with Him in as far as he is against Him, and is not against Him in as far as he is with Him. For instance, he who worked miracles in the name of Christ, and yet did not join himself to the body of His disciples, in as far as he worked the miracles in His name, was with them, and was not against them: again, in that he did not join their society, he was not with them, and was against them. But because they forbade his doing that in which he was with them, the Lord said unto them, Forbid him not; for they ought to have forbidden his being without their society, and thus to have persuaded him of the unity of the Church, but they should not have forbidden that in which he was with them, that is, his commendation of the name of their Lord and Master by the expulsion of devils. Thus the Church Catholic does not disapprove in heretics the sacraments, which are common, but she blames their division, or some opinion of theirs adverse to peace and to truth; for in this they are against us.
On 9:40
(de Con. Evan. 4. 6) By which He shews, that he of whom John had spoken was not so far separated from the fellowship of the disciples, as to reject it, as a heretic, but as men are wont to hang back from receiving the Sacraments of Christ, and yet favour the Christian name, so as even to succour Christians, and do them service only because they are Christians. Of these He says they shall not lose their reward; not that they ought already to think themselves secure on account of this good will which they have towards Christians, without being washed with His baptism, and incorporated in His unity, but that they are already so guided by the mercy of God, as also to attain to these, and thus to go away from this life in security.