Jude has been talking and writing about the character and motives and aims and desire of these false teachers; now he finishes up his epistle with instruction and admonitions and encouragements to his readers and to us.
Verse 20: “But ‘YOU’” John McArthur writes, “True believers have a sure foundation (I Cor. 3:11).” (Use some thoughts from my article “The Right Foundation.”
Col. 2:7: “rooted and built up in Him and established in the faith, as you have been taught, abounding in it with thanksgiving.”
Verse 21: “Keep yourselves…” The believers has a responsibility to be obedient and faithful to the teachings of Jesus and His Apostles. We must “keep in shape.” We build upon our faith; we are told to “grow in the grace and knowledge of the Lord Jesus.”
We are to live our lives in expectation of the coming of Christ (Titus 2:11-15). We must go about it with anticipation “longing” (NIV) for His return.
