14 Quid prodest, fratres mei, si fidem dicataliquis se habere, opera autem non habeat? nunquid potest fides salvum facere ipsum?
15 If a brother or sister be naked, and destitute of daily food,
15 Quod si frater aut soror nudi fuerint, et egentes quotidiano victu,
16 And one of you say unto them, Depart in peace, be ye warmed and filled; notwithstanding ye give them not those things which are needful to the body; what doth it profit?
16 Dicat autem aliquis vestrum illis, Abite cum pace, calescite et saturamini; non tamen dederitis quae sunt necessaria corpori, quae utilitas?
17 Even so faith, if it hath not works, is dead, being alone.
17 Sic et fides, si opera non habuerit, mortua est per se.
14 What doth it profit. He proceeds to commend mercy. And as he had threatened that God would be a severe Judge to us, and at the same time very dreadful, except we be kind and merciful towards our neighbors, and as on the other hand hypocrites objected and said, that faith is sufficient to us, in which the salvation of men consists, he now condemns this vain boasting. The sum, then, of what is said is, that faith without love avails nothing, and that it is therefore wholly dead.
But here a question arises, Can faith be separated from love? It is indeed true that the exposition of this passage has produced that common distinction of the Sophists, between unformed and formed faith; but of such a thing James knew nothing, for it appears from the first words, that he speaks of false profession of faith: for he does not begin thus, "If any one has faith;" but, "If any says that he has faith;" by which he certainly intimates that hypocrites boast of the empty name of faith, which really does not belong to them.
That he calls it then faith, is a concession, as the Rhetoricians say; for when we discuss a point, it does no harm, nay, it is sometimes expedient, to concede to an adversary what he demands, for as soon as the thing itself is known, what is conceded may be easily taken away from him. James then, as he was satisfied that it was a false pretext by which hypocrites covered themselves, was not disposed to raise a dispute about a word or an expression. Let us, however, remember that he does not speak according to the impression of his own mind when he mentions faith, but that on the contrary he disputes against those who made a false pretense as to faith, of which they were wholly destitute.
Can faith save him? This is the same as though he had said, that we do not attain salvation by a frigid and bare knowledge of God, which all confess to be most true; for salvation comes to us by faith for this reason, because it joins us to God. And this comes not in any other way than by being united to the body of Christ, so that, living through his Spirit, we are also governed by him. There is no such thing as this in the dead image of faith. There is then no wonder that James denies that salvation is connected with it. 
15 If a brother, or, For if a brother. He takes an example from what was connected with his subject; for he had been exhorting them to exercise the duties of love. If any one, on the contrary, boasted that he was satisfied with faith without works, he compares this shadowy faith to the saying of one who bids a famished man to be filled without supplying him with the food of which he is destitute. As, then, he who sends away a poor man with words, and offers him no help, treats him with mockery, so they who devise for themselves faith without works, and without any of the duties of religion, trifle with God. 
17 Is dead, being alone. He says that faith is dead, being by itself, that is, when destitute of good works. We hence conclude that it is indeed no faith, for when dead, it does not properly retain the name. The Sophists plead this expression and say, that some sort of faith is found by itself; but this frivolous caviling is easily refuted; for it is sufficiently evident that the Apostle reasons from what is impossible, as Paul calls an angel anathema, if he attempted to subvert the gospel. (Galatians 1:8.)
 When he says "Can faith save him?" his meaning is "Can the faith which he says he has save him?" that is, faith which is dead and produces no works; for that is the faith clearly intended here, as it appears from what follows. To make the meaning more evident, Macknight renders the sentence thus, -- "Can this faith save him?" that is, the faith that has not works.  This is adduced as an illustration: as the saying of a man to the naked, "Be ye clothed," when he does nothing, effects no good, is wholly useless, so is that faith that produces no works; it being as it were dead, it cannot save.
 This is adduced as an illustration: as the saying of a man to the naked, "Be ye clothed," when he does nothing, effects no good, is wholly useless, so is that faith that produces no works; it being as it were dead, it cannot save.