"Because of this, gird." Peter uses the word "So" here to refer back to everything he has said about salvation, their faith, and the Spirit of Christ giving revelations to the prophets.
Girding up the loins refers to preparing to work hard. It comes from the custom of tucking the bottom of one's robe into a belt around the waist in order to move with ease. Alternate translation: "get your minds ready" (See: [[rc://en/ta/man/translate/figs-idiom]])
Here the word "sober" refers to mental clarity and alertness. Alternate translation: "Control your thoughts" or "Be careful about what you think" (See: [[rc://en/ta/man/translate/figs-idiom]])
This can be stated in active form. Alternate translation: "the grace that God will bring to you" (See: [[rc://en/ta/man/translate/figs-activepassive]])
Here God's way of dealing kindly with believers is spoken of as if it were an object that he will bring to them. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This refers to when Christ returns. This can also be expressed with an active form. See how you translated this in [1 Peter 1:7](./06.md). Alternate translation: "when Jesus Christ appears to all people" (See: [[rc://en/ta/man/translate/figs-activepassive]])