24 Now to Him who is able to keep you from stumbling, and to make you stand in the presence of His glory blameless with great joy, 25 to the only God our Savior, through Jesus Christ our Lord, be glory, majesty, dominion and authority, before all time and now and forever. Amen. (Jude 24–25, NASB95)
Since God is able to “keep” (preserve) you stumbling, the possibility of stumbling necessarily exists (cf. Gal. 5:7). He will stand you blameless before Him, when you build up yourselves in the faith, pray in the Spirit, and keep (preserve) yourselves in the love of God (Jude 20-21). Eternal life, while provided by the power and authority of “the only God our Savior,” is not unconditional. “He who believes and is baptized will be saved” (Mk. 16:16); Belief and baptism are conditions that one must meet in order to be saved. “Therefore, brethren, be even more diligent to make your call and election sure, for if you do these things you will never stumble; for so an entrance will be supplied to you abundantly into the everlasting kingdom of our Lord and Savior Jesus Christ” (2 Pet. 1:10-11). Note the word “if” – “if you do these things…” That’s a condition the Christian must meet in order to have confidence of gaining entrance into the eternal kingdom. God has the “dominion and authority” to save you. He calls on you to be loyal to Him by remaining steadfast and faithful.