Pentecost, one of God’s Holy Days, is very much about conversion—as shown in Acts 2 when God sent His Holy Spirit to the early Church, enabling them to be miraculously transformed. But what is conversion—the change that God wants to see in us? We can better understand by looking at the life of the apostle Peter, comparing his initial decision to follow Jesus Christ at the beginning of His ministry with Peter’s later decision to follow Christ after Jesus’ resurrection and ascension. Peter became a changed man, and those changes—particularly in three specific areas covered in this sermon—hold great lessons for us.