Peter’s argument since 1 Peter 2:11 was that his readers were to provide occasion for the unbelieving Gentiles around them to “see [their] good deeds” (see also 1 Peter 2:12, 1 Peter 2:15, 1 Peter 2:20), all with a view to those Gentiles ultimately glorifying God. In the context of marriage as it appeared in Greek society in Peter’s day, such “good deeds” included submission on the wife’s part to her husband, a submission possible through placing your hope in God (1 Peter 3:5). With this closing phrase Peter refers the “wives” back to what motivated his instruction to them (1 Peter 2:11–12), and so ties it all together into a single package.
6 as Sarah obeyed Abraham, calling him lord. And you are her children, if you do good and do not fear anything that is frightening.