Love of God (Jude 1:19-21)
Verse 19 These are the ones who cause divisions, worldly-minded, devoid of the Spirit. Not from sinners openly profane; such a separation is commendable, being according to the will and word of God, to the mind and practice of Christ, and which tends to the good of men, and to the glory of God; but from the saints and people of God; it is possible that a child of God may for a time leave the fellowship of the saints, but an entire and total forsaking of them, and of assembling with them, looks with an ill aspect; nor did they separate themselves from superstition and will worship, and every false way of worship which would have been right but from the pure worship, ordinances, and discipline of God's house, by a perversion of them and as being above them or unwilling to be under any notice and government; not from errors and heresies, and persons that held them; but from the pure doctrines of the Gospel, ministers of the Word, who made divisions among the churches, for worldly ends, with pride and vain glory.
Verse 20 But you, beloved, building yourselves up on your most holy faith, praying in the Holy Spirit, The doctrine of faith in all its branches, which is holy, a most holy doctrine; which displays the holiness of God, and is a means of beginning and increasing internal holiness in the saints, and of encouraging and exciting them to external holiness of life and conversation: this phrase, holy faith, is in use with the Jews: and it becomes the saints to build up one another upon this; the doctrine of faith, is a foundation to build upon, particularly what regards the person, offices, and grace of Christ, and is itself of an edifying nature; and they should not content themselves with their present knowledge of it, but seek for an improvement in it; and though they were passive when first built on Christ and his doctrines, and though ministers are greatly instruments in building of them up more and more; yet they are capable of building up themselves, and one another, by attending on the ministry of the Word, and by private conversation.
Verse 21 keep yourselves in the love of God, waiting anxiously for the mercy of our Lord Jesus Christ to eternal life. Grace or unmerited favor of God, that love with which God loves his people; and then the exhortation to the saints to keep themselves in it is, to set it always before them, to keep it constantly in view, to exercise faith on it, firmly believing their interest in it; as also to meditate on it, give themselves up wholly to the contemplation of it, and employ their thoughts constantly about it, which is the foundation of all grace here, and glory hereafter; or to preserve themselves by it, for so the words may be rendered, preserve yourselves by the love of God; against Satan's temptations, the snares of the world, and the lusts of the flesh; whenever Satan solicits to sin, and any snare is laid to draw into it, and the flesh attempts to be predominant, saints should betake themselves to the love of God, as to a strong hold and preservative against sin, and reason as Joseph did, Genesis 39:9, for the love of God, and continuance in it, do not depend on anything that can be done by men.