A.B. Simpson concludes his sermon on Hebrews Chapter 14 by emphasizing the practical applications of faith, which is rooted in love, contentment, and service to others. He highlights the importance of being steadfast in faith, submitting to spiritual leaders, and engaging in mutual prayer, all while recognizing Jesus as the Great Shepherd who reconciles us to God through the everlasting covenant. Simpson encourages believers to embrace their identity in Christ, allowing God's work within them to manifest in good deeds that please Him. The sermon culminates in a powerful benediction, affirming that it is God who equips us for every good work, leading to a life of holiness and praise.