James 5:19

Brethren, if any of you do err from the truth, and one convert him;

Brethren, if any of you do err from the truth,.... Either from Christ, who is the truth, by departing from him, forsaking his ways, worship, and ordinances; or from the Scriptures of truth, not speaking according to them, and embracing notions that are contrary unto them; or from the Gospel, the word of truth, from the doctrine of faith, and from uprightness of life and conversation, after having made a profession of Christianity; for this is to be understood of one who has embraced the Christian religion, become a member of a church, and has walked in the path of truth and holiness, but now fallen into error, either in principle, or in practice, or both:

and one convert him; or turn him from his error, to truth again; for this designs not first conversion, or the turning of a sinner from darkness to light, from the power of Satan to God, and from the evil of a man's heart and ways and from a dependence on his own righteousness, to the Lord Jesus Christ, to look to him for righteousness, life, and salvation, which is wholly and entirely God's work, and not man's; but conversion after backslidings; for a restoration from a fallen condition is sometimes so called,

Psalms 51:1 and which one brother may be an instrument of to another, by showing him, and setting before him, the evil of his errors, whether in principle or practice; and by instructing him in the doctrines of the Gospel, and in the duties of religion; and by reproving him in meekness, and according to the rules of Christ; which means are sometimes blessed for the gaining of such; and which may be called conversion: and also, this is sometimes done by praying for him; and which seems chiefly to be intended here; for from praying for the healing of the diseases of the body, the apostle proceeds to encourage the saints to pray for one another, for the healing of the diseases of the mind; and suggests, that if prayer avails to the one, it may to the other; and which is the most desirable, and the greatest blessing, as follows.