The central message of this sermon is that true motivation for good works comes from a living relationship with Christ, rather than from human effort or plans. The speaker emphasizes that salvation is by faith alone, not by works, and that good works are the natural result of a person's faith in God. The sermon also highlights the importance of trusting in God's involvement and provision in our lives, as exemplified by Nehemiah's prayer in the face of opposition. The takeaway for listeners is to keep their focus on God and His purposes, rather than relying on human plans or efforts alone, and to remember that faith will always manifest itself in good works. This central message advances the belief that salvation is a gift from God, received through faith, and that our actions should flow from a living relationship with Christ, rather than being driven by self-effort.