This week we start a new sermon series focusing on the book of Acts. We're starting with Peter's sermon on the day of Pentecost. It was a seminal moment for the early Christian church. A large crowd had gathered. Everyone was curious about this group of Jesus' disciples. What does Peter say? Exactly what you'd expect. He preaches about Jesus, about sin and grace, about the stubbornness of humanity and the unstoppable plan of God.