A.B. Simpson concludes his sermon by emphasizing the practical applications of faith as outlined in Hebrews 13, focusing on love, contentment, constancy, and service. He highlights the importance of mutual prayer and submission within the Christian community, urging believers to embody the teachings of Christ in their daily lives. Simpson reassures the congregation of God's peace and the everlasting covenant established through the blood of Jesus, which empowers them to fulfill God's will. He encourages a life of holiness and good works, reminding them that it is God who works in them to achieve this. The sermon culminates in a doxology, praising God for His sustaining grace and the transformative power of His love.