This sermon contrasts true Christian zeal, which is grounded in the knowledge of God's Word, with false zeal driven by emotion and self-will. Using the example of Peter striking off the servant's ear, the speaker illustrates how impulsive action without biblical foundation leads to rebuke, whereas Mary of Bethany demonstrates devotion rooted in a transformed heart. The message emphasizes that genuine faith requires the mind, emotions, and will to be aligned with Scripture, resulting in actions that glorify God rather than seek human success. By comparing Peter's misguided energy, Judas's sinful ambition, and Mary's sacrificial love, the text argues that authentic zeal is quiet, consistent, and always subordinate to divine truth. Ultimately, believers are called to cultivate a heart transformed by the Holy Spirit, ensuring their fervor reflects a deep understanding of Christ's work.