Charles Finney delivers a powerful sermon on 'Christian Warfare,' emphasizing the internal conflict between the will and the sensibility, and clarifying that true Christian warfare is not against inbred sin but against temptation. He explains that walking in the Spirit enables believers to resist the lusts of the flesh, and he outlines the nature of this warfare, including the differences between careless and convicted sinners, as well as the struggles faced by saints versus unconverted professors. Finney stresses that this warfare is a necessary part of the Christian experience, which will continue in some form while believers are in the body, and he encourages reliance on Christ for victory over temptation.