A.T. Robertson Commentary Jude 1:21

"keep yourselves in the love of God, looking for the mercy of our Lord Jesus Christ unto eternal life." — Jude 1:21 (ASV)

Keep yourselves (εαυτους τηρησατε). First aorist active imperative (of urgency) of τηρεω. In verse 1 they are said to be kept, but note the warning in verse 5 from the angels who did not keep their dominion. See also Jas 1:27. In Php 2:12 both sides (human responsibility and divine sovereignty are presented side by side).

Looking for (προσδεχομενο). Present middle participle of προσδεχομα, the very form in Tit 2:13. The same idea in προσδοκωντες in 2 Peter 3:14.