J.C. Philpot preaches about the trials and temptations faced by the servants of God, using the example of the apostle Paul's thorn in the flesh and the messenger of Satan to highlight the necessity of experiencing weakness to fully rely on the strength of Christ. Philpot emphasizes the importance of learning our weakness through trials, as it leads us to depend on the Lord's strength, teaching us humility and deepening our communion with Him. He explains how our infirmities, though not sins, bring us into continual contact with the Lord, allowing us to experience His power and grace in our lives, ultimately leading us to glory in our weaknesses for the power of Christ to rest upon us.