The sermon explores the concept of Christian usefulness, drawing from John 3:22-30 and Philemon 10-11 to illustrate that true service to God involves a deliberate decrease of self and an increase in Christ. Examining the context of John the Baptist's ministry and his joyful relinquishment of the spotlight, the message emphasizes Christian humility, urging listeners to embrace attitudes of envy, joy, and ultimately, a willingness to prioritize God's glory above personal recognition, mirroring Christ's own self-emptying for the sake of redemption.