This epistle is addressed to all believers in the gospel. Its design appears to be to guard believers against the false teachers who had begun to creep into the Christian church, and to scatter dangerous tenets, by attempting to lower all Christianity into a merely nominal belief and outward profession of the gospel. Having thus denied the obligations of personal holiness, they taught their disciples to live in sinful courses, at the same time flattering them with the hope of eternal life. The vile character of these seducers is shown, and their sentence is denounced, and the epistle concludes with warnings, admonitions, and counsels to believers.
The apostle exhorts to stedfastness in the faith. (1-4) The danger of being infected by false professors, and the dreadful punishment which shall be inflicted on them and their followers. (5-7) An awful description of these seducers and their deplorable end. (8-16) Believers cautioned against being surprised at such deceivers arising among them. (17-23) The epistle ends with an encouraging doxology, or words of praise. (24,25)
Verses 1-4 Christians are called out of the world, from the evil spirit and temper of it; called above the world, to higher and better things, to heaven, things unseen and eternal; called from sin to Christ, from vanity to seriousness, from uncleanness to holiness; and this according to the Divine purpose and grace. If sanctified and glorified, all the honour and glory must be ascribed to God, and to him alone. As it is God who begins the work of grace in the souls of men, so it is he who carries it on, and perfects it. Let us not trust in ourselves, nor in our stock of grace already received, but in him, and in him alone. The mercy of God is the spring and fountain of all the good we have or hope for; mercy, not only to the miserable, but to the guilty. Next to mercy is peace, which we have from the sense of having obtained mercy. From peace springs love; Christ's love to us, our love to him, and our brotherly love to one another. The apostle prays, not that Christians may be content with a little; but that their souls and societies may be full of these things. None are shut out from gospel offers and invitations, but those who obstinately and wickedly shut themselves out. But the application is to all believers, and only to such. It is to the weak as well as to the strong. Those who have received the doctrine of this common salvation, must contend for it, earnestly, not furiously. Lying for the truth is bad; scolding for it is not better. Those who have received the truth must contend for it, as the apostles did; by suffering with patience and courage for it, not by making others suffer if they will not embrace every notion we call faith, or important. We ought to contend earnestly for the faith, in opposition to those who would corrupt or deprave it; who creep in unawares; who glide in like serpents. And those are the worst of the ungodly, who take encouragement to sin boldly, because the grace of God has abounded, and still abounds so wonderfully, and who are hardened by the extent and fulness of gospel grace, the design of which is to deliver men from sin, and bring them unto God.
Verses 5-7 Outward privileges, profession, and apparent conversion, could not secure those from the vengeance of God, who turned aside in unbelief and disobedience. The destruction of the unbelieving Israelites in the wilderness, shows that none ought to presume on their privileges. They had miracles as their daily bread; yet even they perished in unbelief. A great number of the angels were not pleased with the stations God allotted to them; pride was the main and direct cause or occasion of their fall. The fallen angels are kept to the judgment of the great day; and shall fallen men escape it? Surely not. Consider this in due time. The destruction of Sodom is a loud warning to all, to take heed of, and flee from fleshly lusts that war against the soul, ( 1 Peter. 2:11 ) Stand in awe, therefore, and sin not, ( Psalms 4:4 ) . Let us not rest in anything that does not make the soul subject to the obedience of Christ; for nothing but the renewal of our souls to the Divine image by the Holy Spirit, can keep us from being destroyed among the enemies of God. Consider this instance of the angels, and see that no dignity or worth of the creature is of avail. How then should man tremble, who drinketh iniquity like water! ( Job 15:16 ) .