In Acts 2, the Holy Spirit comes upon the body of Christ, indwelling and filling, to use them to proclaim Christ’s salvation to the world. The Spirit begins His work through them by preaching. Peter the apostle becomes Peter the preacher, and teaches us about how good proclamation of the word is done. For those who preach now or will later, and for all who want to place themselves under effective biblical preaching, this episode in our “Life of Peter: Growing in Grace” series is important.