What makes a church a church? After all, many religious groups meet regularly to talk about their common values and their common mission. Is there something unique about the gathering of Christ’s followers? In this sermon on Matthew 16:13–28, David Platt looks at the first trait of a healthy church––biblical evangelism––and what this has to do with an all-important question Jesus asked his disciples nearly two thousand years ago. We’ll see how the church’s identity is tied to believing and proclaiming the gospel.