The sermon centers on the assurance of rest and grace available to believers, drawing heavily from Hebrews 4. It emphasizes that despite past failures and present struggles, including recent events causing grief, the ultimate need is not merely comfort but reconciliation with God through Christ. The message encourages listeners to approach God's throne of grace with confidence, recognizing Jesus as a sympathetic high priest who understands human weakness and offers mercy and grace to help in times of need. Ultimately, the sermon underscores the importance of diligent faith and a steadfast reliance on God's provision, rather than attempting to fix life's challenges through human effort alone.