A.W. Pink expounds on the Tenth Commandment, emphasizing that it forbids not only the outward act of coveting but also the internal desires and inclinations of the heart. He explains that concupiscence, or unlawful lusting, is the root of sin, and that God’s law extends to our thoughts and imaginations, holding us accountable for our inner life. Pink highlights the importance of recognizing these hidden sins, as they lead to overt actions, and stresses that true obedience to God involves purity of heart. He concludes that the Tenth Commandment serves as a guard for the other commandments, revealing our sinful nature and pointing us to the grace found in Christ. Ultimately, it calls believers to seek cleansing from secret faults and to rely on God's grace for true transformation.