The word Peter uses means “in the same way,” and so requires us to recall the line of thought Peter had been developing. His readers were “sojourners and exiles” (1 Peter 2:11) among their compatriots because their focus was fixed on a better homeland as a result of being “born again to a living hope through the resurrection of Jesus Christ from the dead, to an inheritance…kept in heaven” (1 Peter 1:3–4). That focus left them open to suspicion from their spiritually unborn community, a reality they were to counter with honourable conduct among the Gentiles (1 Peter 2:13). That honourable conduct was to look like a willing submission to “every human institution” (1 Peter 2:13). The implication of that instruction was the command to “honor everyone” (1 Peter 2:17), including a possible unjust master (1 Peter 2:18). That is the line of thought Peter hooks on to with the term “likewise” in 1 Peter 3:1. Being subject to every human institution (and so honouring every person in such institutions) includes marriage, even to an unbelieving husband.
1 Likewise, wives, be subject to your own husbands, so that even if some do not obey the word, they may be won without a word by the conduct of their wives,