"But you, dear friends, by building yourselves up in your most holy faith and praying in the Holy Spirit, keep yourselves in God's love as you wait for the mercy of our Lord Jesus Christ to bring you to eternal life." (Jude 1:20-21)
Jude, the brother of James and therefore the brother of the Lord, writes with urgency to a community whose faith is under attack from within. He had intended to write about the salvation they share, but finds it necessary to urge them to contend for the faith that was once for all entrusted to God's holy people. Certain individuals have crept in unnoticed, whose condemnation was written about long ago: ungodly people, who pervert the grace of God into a licence for immorality and deny Jesus Christ as their only Sovereign and Lord. The Catechism identifies the faith once for all delivered to the saints as the Deposit of Faith: the whole of divine revelation, completed in Christ and entrusted to the Church, which cannot be added to or subtracted from (CCC 84).
Jude then marshals a series of Old Testament examples of those who were judged for their rebellion: the unbelieving Israelites who perished in the wilderness, the angels who did not keep their positions, Sodom and Gomorrah. These dreamers pollute their own bodies, reject authority, and heap abuse on celestial beings. They are like Cain, Balaam, and Korah. They are shepherds who feed only themselves, clouds without rain, wild waves of the sea, wandering stars for whom blackest darkness has been reserved forever.
But the community is to remember what the apostles foretold: in the last times there will be scoffers who follow their own ungodly desires. These are the people who divide you, who follow mere natural instincts and do not have the Spirit. But you, dear friends, by building yourselves up in your most holy faith and praying in the Holy Spirit, keep yourselves in God's love as you wait for the mercy of our Lord Jesus Christ to bring you to eternal life. Be merciful to those who doubt; save others by snatching them from the fire; to others show mercy mixed with fear. To him who is able to keep you from stumbling and to present you before his glorious presence without fault and with great joy, to the only God our Saviour be glory, majesty, power, and authority, through Jesus Christ our Lord, before all ages, now and forevermore.
Brothers and sisters, build yourselves up in your most holy faith. Not passive maintenance of inherited religion. Active, intentional construction: prayer in the Holy Spirit, keeping yourselves in God's love, waiting for the mercy that leads to eternal life. Jude's programme for the besieged community is not retreat but deeper roots. The storm outside cannot blow down what has been built up from inside.
To him who is able to keep us from stumbling and to present us before his glorious presence without fault and with great joy: to the only God our Saviour be glory, majesty, power, and authority, through Jesus Christ our Lord, before all ages, now and forevermore. Amen.