A.B. Simpson emphasizes the necessity of practical obedience in the Christian life, urging believers to be doers of the Word rather than mere hearers. He explains that true obedience stems from understanding God's will as the ultimate authority and the Word of God as the standard for right and wrong. Simpson illustrates how the law of liberty transforms obedience from a burden into a joyful expression of love for God, and he highlights the importance of self-examination through the Word to foster spiritual growth. He concludes that blessings come through action, encouraging believers to live out their faith actively and selflessly, as demonstrated by biblical examples.