A.B. Simpson emphasizes the significance of the coming of the Lord as articulated by the Apostle Peter in his letters. He highlights Peter's calm and disinterested perspective on the Lord's return, contrasting it with the eager expectations of other apostles. Simpson discusses the prophetic assurance of Christ's coming, the importance of personal preparation, and the urgency of spreading the Gospel to hasten this event. He warns of the suddenness and severity of the final judgment while encouraging believers to live in holiness and anticipation of Christ's return. Ultimately, he calls for a deep longing for the Lord's coming, urging the faithful to be ready and to share the hope of salvation with others.