Andrew Bonar emphasizes the significance of the doctrine of the Second Advent as a powerful motivator for holiness among believers. He shares personal testimonies illustrating how the anticipation of Christ's return can transform lives, instilling joy and assurance in faith. Bonar argues that this hope not only encourages believers to live righteously but also fosters a deep personal relationship with Jesus, leading to a life marked by holiness and service. He highlights that the longing for Christ's return should inspire believers to remain diligent in their faith and to comfort one another with the promise of His coming. Ultimately, Bonar calls for a life lived in expectation of the Lord's return, which serves as a catalyst for spiritual growth and perseverance.