The sermon examines the nature of obedience and the hypocrisy of those who profess faith but fail to act upon it, drawing from Matthew 21. It contrasts the actions of two sons, one who initially refuses his father's request but later relents, and another who verbally agrees but ultimately fails to follow through, illustrating that true obedience stems from a transformed heart rather than mere outward agreement. The message highlights the importance of genuine repentance and commitment, exemplified by tax collectors and harlots who responded to John's preaching, and cautions against mental assent without action, emphasizing that God desires a covenant-keeping people who consistently uphold their promises and reflect His character through their actions.