Beloved, the same Peter who had denied he knew Jesus Christ a few days earlier is now preaching the Gospel of Jesus Christ. Why the sudden change? Jesus had restored Peter and the Holy Spirit had filled him with boldness.
Peter’s preaching of the Gospel provides us with some well- needed guidelines on how we are to preach the Gospel. First of all, Peter’s sermon contains two main points, (1) The proclamation of the Gospel (life, death, burial, resurrection and ascension of Christ and (2) The exhortation to repent.
Peter also emphasizes four other facets of Christianity, (1) The Last Days, (2) the story of the life of Christ (3) the fact that the Scriptures prove that Jesus Christ is the Messiah and (4) the veracity that we must repent of our sins to enter the Kingdom of Heaven.
Thus, Peter’s sermon gives us an outline on how we are to witness to a lost and dying world in need of a Savior. We must learn to keep the main thing the main thing and Jesus Christ is always the main thing! In fact, later on in his ministry, Peter goes on to say as recorded in Acts 4:12, “Salvation is found in no one else, for there is no other name under heaven given to men by which we must be saved.”