1 Peter 1:12,13 - With minds that are fully alert

1:12

The prophets had a sense that they were serving something greater than themselves. Again, we can apply this to ourselves. It is not all about us, we are part of something greater. The apostles preached the gospel that the prophets had looked forward to. There is absolute continuity between the Old and New Testaments. The prophets were inspired by the Holy Spirit, and the apostles were likewise inspired. Even the  angels did not fully understand. We need to appreciate the wonder of the gospel.

1:13

I prefer the older NIV translation here, or the current ESV, which speaks of preparing our minds for action, or as the Greek (and KJV) say, “gird up the loins of your minds”. Our minds need to be ready, alert. Sometimes Christians have tended to denigrate the mind, the Bible never does that, Instead it advocates the right use of the mind, and sees it as an essential tool in our walk with the Spirit. We are to be sober-minded. That does not just mean not being drunk (though that is sound advice), but thinking clearly. The world and circumstances will seek to befuddle our thinking, giving us a distorted view. We need the word of God to give us a clear view. We are to set our hope on the grace to be given to us when Christ returns. Peter lays a great emphasis on the future blessing, we should do likewise.