Here the word "sober" refers to mental clarity and alertness. See how you translated this in [1 Peter 1:13](../01/13.md). AT: "Control your thoughts" or "Be careful about what you think" (See: [[rc://en/ta/man/translate/figs-idiom]])
Peter compares the devil to a roaring lion. Just as a hungry lion completely devours its prey, the devil is seeking to completely destroy the faith of believers. (See: [[rc://en/ta/man/translate/figs-simile]])