The sermon centers on the necessity of a faith that is alive and evidenced by works, using Rahab the prostitute as a powerful example of genuine faith demonstrated through courageous action. It contrasts forensic justification—God's declaration of righteousness by faith—with demonstrative justification, where a believer's life proves the authenticity of their faith, as seen in Rahab's confession, protection of the spies, and covenant with them. The analogy of a body without a spirit underscores that faith without works is dead, emphasizing that true belief must produce tangible, transformative behavior. The preacher affirms that James and Paul are not in conflict but harmonize in teaching that saving faith inevitably results in a changed life, calling believers to examine whether their profession of faith aligns with their conduct, and urging repentance and trust in Christ for those whose lives contradict their claims.