Today the Lord Jesus invites us to see everyone in a new light-through the lens of love. Who is included in this? Everyone. And Everyone means everyone, saint and sinner alike. There are no exceptions in Jesus' inclusivity.
Peter has a vision which transforms him from a Jewish-Jesus follower to an inclusive Jesus follower. In doing so he must overcome primary core faith practices he has followed since birth. He literally has to change the way he thinks and acts. If he hadn't done so, we would probably not be sitting in this church today. Without Peter's conversion the church would be different.
We as modern day disciples of Christ are invited to do the same.
Jesus says, "I give you a new commandment, that you love one another. Just as I have loved you, you also should love one another. By this everyone will know that you are my disciples, if you have love for one another." John13:34-35