David Platt, Follow Me, 2013, page 19.
The very first word out of Jesus’ mouth in His ministry is clear: repent. It’s the same word that John the Baptist proclaims in preparation for Jesus’ coming. This word is also the foundation for the first Christian sermon in the book of Acts. After Peter proclaims the good news of Christ’s death for sin, the crowds ask him, “What shall we do?” Peter looks them right in their eyes and says, “Repent.”
David Platt, Follow Me, 2013, page 19.