These verses link the unveiling of Jesus Christ with our future and all that the Father is working out. Verse 3 recalls to us our status as children of God, reminding us that our hope lies in the resurrection from the dead, when we will be composed of spirit, able to inherit the Kingdom (see I Corinthians 15:50). God Himself safeguards this perfect inheritance, which can never be diminished, for all those who are regenerated and endure to the end.
Verse 5 reminds us that our salvation will be revealed "in the last time." This gives us reason for great rejoicing, even though various trials may grieve us. Those trials are necessary, Peter tells us in verse 7, so that the genuineness of our faith—the tried and proven character of our faith—may be found when Jesus Christ is unveiled to the entire world (cf. Luke 18:8).
Verse 8 points out the contrast that, at this time, we do not see Him with our eyes because He is still veiled, hidden from the world. His revelation has not yet occurred. Even though we cannot see Him now, we still love Him and can still rejoice because we know that the Father will soon send Him back to this earth. Then, every eye will see Him (Revelation 1:7).
Verse 13 summarizes what we should be doing as a result of this understanding. We need to brace ourselves mentally, and think, plan, and act seriously and circumspectly, setting our hope wholly on the divine favor that the revelation of Jesus Christ will bring to us. For concurrent with the apocalypsis of Christ is the salvation of the saints, both living and dead.
David C. Grabbe
What Is the Book of Revelation?
There will be everlasting joy when God's Kingdom is established on earth. Joy and gladness are not only deep inward feelings, but they are also expressed in visible celebration when God's people gather together. Speaking of the future church, Isaiah 60:15 says, "Whereas you have been forsaken and hated, so that no one went through you, I will make you an eternal excellence, a joy of many generations." In the meantime, the apostle Paul advises us to "rejoice in the Lord always. Again, I will say, rejoice!" (Philippians 4:4)
Martin G. Collins