This sermon defines sanctification as God's ongoing work of conforming believers to the image of Christ, emphasizing that spiritual growth is an inevitable result of genuine salvation. The preacher refutes the concept of a permanent 'carnal Christian,' arguing that while believers may backslide or mature at different rates, true regeneration always produces progressive holiness. By examining passages in 1 Corinthians and other epistles, the text demonstrates that every genuine believer is being transformed from glory to glory, even amidst struggles with sin. The message warns against the danger of false assurance, asserting that a lack of spiritual growth indicates a lack of saving faith rather than a unique category of Christian experience. Ultimately, the sermon encourages believers to pursue steady progress in Christlikeness, trusting in God's faithful work from conversion to glorification.