But you are a chosen race, a royal priesthood, a holy nation, a people for his own possession, that you may proclaim the excellencies of him who called you out of darkness into his marvelous light. Once you were not a people, but now you are God's people; once you had not received mercy, but now you have received mercy.Beloved, I urge you as sojourners and exiles to abstain from the passions of the flesh, which wage war against your soul. Keep your conduct among the Gentiles honorable, so that when they speak against you as evildoers, they may see your good deeds and glorify God on the day of visitation.It's a rather strong contrast here from the stumbling disobedience of the previous verses. We are not that anymore. Rather a chosen race, a royal priesthood, a holy nation, a people for God's possession. But none of this is without purpose. This is all so that we may proclaim God's excellencies, his glory for what he has done for us. And what has he done? Called us out of darkness into light, made us his people, given us mercy. These are grand things.
Next, rules. What? Why rules now? Because the passions of the flesh wage war against my soul. It is for my own good. Also, good conduct is one of the ways I can proclaim what God has done and thus fulfill part of my purpose. When I am spoken against as an evildoer the people will see my good deeds and glorify God. It isn't for my own glory. It's for God's glory. This is why I am set apart, for this work, for God's glory.