A.W. Tozer discusses the ongoing tension between the old nature and the new nature in believers, emphasizing that while Christ's character remains unchanged, the presence of the old nature often leads to un-Christlike behavior. He argues that the struggle is not merely a sign of false faith but a continuous battle within true Christians, as the old nature competes with the new nature where Christ dwells. Tozer encourages believers to seek victory through a prayerful study of Romans 6 to 8, asserting that allowing Christ complete control will enable them to reflect His holiness and compassion as He did in Galilee.