A.B. Simpson emphasizes the role of faith as a guiding light during dark times, using examples from the Old Testament such as Gideon, Barak, Samson, Jephthah, David, and Samuel. Each figure exemplifies different aspects of faith, from Gideon's strength in weakness to David's ability to wait for God's timing. Simpson illustrates that true faith often emerges in adversity and is not reliant on human strength or circumstances. He encourages believers to trust in God's promises and to act in faith, as demonstrated by these biblical heroes. Ultimately, the sermon calls for a faith that listens to God and speaks His truth to the world.