God's sovereign power and authority cover not only our salvation, but all of live. He made all things and keeps all things. Jude reminds us that God's sovereign power extends to His keeping us from stumbling, and bringing us to eternal joy in his presence. And not only is God able to keep us, but He desires and intends to keep us.
24 Now to him who is able to keep you from stumbling and to present you blameless before the presence of his glory 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. (ESV)