犹大书 1:21

keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life.

Keep yourselves in the love of God ... Again the human response factor is stressed, the meaning here being exactly what it was in Jude 1:1:20, "keeping oneself in the love of God" being one and the same thing with obeying God's commandments, as extensively taught in the Johannine literature, above. Summarizing the admonitions of these verses, what Jude commanded, or rather pleaded that the faithful should do, we have this: (1) work at your faith; (2) give constant attention to prayer; (3) receive, cultivate and cherish the indwelling Spirit; (4) keep yourselves in God's love through strict obedience to his will; and (5) wherein one is frustrated or discouraged by failures (and there will be failures); (6) look unto the mercy of the Lord Jesus Christ who will save the last unworthy one of us if we give him half a chance to do so!

Eternal life ... Notice that this is preceded by "unto," indicating that in some vital aspects of it, we do not now have eternal life; but this is not to deny John's great promises regarding this; because they may be fully understood as our actual possession of eternal life, in the sense of having the blessed promise of it, the assurance of it, the earnest of it, and the vital, living hope of it.