The sermon centers on the profound truth of God's will—both His hidden, sovereign decree and His revealed, gracious command—emphasizing that true discipleship requires the daily renunciation of self-will and the embrace of God's perfect plan, as exemplified by Christ's submission to the cross. Drawing from Matthew 16, it highlights Peter's failure to accept Jesus' suffering as part of God's will, illustrating how human reasoning, even when well-intentioned, opposes divine purpose, and how obedience to God's revealed will—found in Scripture and fulfilled in Christ—is the path to eternal life and true joy. The prayer 'Your will be done on earth as it is in heaven' is not merely a petition but a call to adopt an eternal perspective, aligning our lives with the angelic worship of heaven and trusting that God's will, though often mysterious, is always good, sovereign, and ultimately triumphant. This submission is both a daily discipline and a source of deep comfort, as it frees believers from the burden of self-reliance and anchors them in the certainty of God's providential care and future glory.