The Apostle Peter
1 Peter 1:13BSB·traditional attribution

Therefore prepare your minds for action. Be sober-minded. Set your hope fully on the grace to be given you at the revelation of Jesus Christ.

John Calvin Reformed @genevareformer

From the greatness and excellency of grace he draws an exhortation, that it surely behoved them the more readily to receive the grace of God, as the more bountifully he bestowed it upon them. And we must notice the connection: he had said, that so elevated was the kingdom of Christ, to which the gospel calls us, that even angels in heaven desire to see...

Matthew Henry Presbyterian @wholebiblehenry

Here the apostle begins his exhortations to those whose glorious state he had before described, thereby instructing us that Christianity is a doctrine according to godliness, designed to make us not only wiser, but better. I. He exhorts them to sobriety and holiness. 1. Wherefore gird up the loins of your mind, etc., Pe1 1:13.

Commenting on 1 Peter 1:13-23

John Gill Reformed Baptist @doctorgill

Wherefore gird up the loins of your mind,.... With the girdle of truth; see Eph 6:14 since angels desire to look into the mysteries of grace, do you apply your minds, and diligently attend unto them, in opposition to all loose and vagrant thoughts of the mind, about other things: give yourselves up wholly to them, meditate upon them, employ yourselves in them, and about...