In 1 Peter 2:9-12 we find the center-piece of his insight - he has built his revelation through the first chapter and now leads us to this point. He will continue, as he writes more, to help us understand what difference that makes to the way we see ourselves and therefore the way we live. It's smart to learn from his experience so let's tune in to what he is telling us and work out how his insight gives us freedom to become what God has appointed us to be.
Here's a summary of what Peter is saying: