The sermon, drawn from 2 Timothy 2:14–26, calls believers to be useful servants of God by avoiding fruitless disputes, pursuing personal holiness, and engaging the world with both wisdom and grace. It emphasizes that true usefulness comes not from debate or cultural conformity, but from rightly handling the Word of God, cleansing oneself from sin, and maintaining a pure fellowship rooted in Christ. The preacher warns against the futility of quarreling over non-essentials, using Proverbs and Paul's letters to illustrate when to remain silent and when to speak with gentleness and firmness. Central to this call is the image of the believer as a cleansed vessel, set apart for holy use, shaped by the Holy Spirit's work and the discipline of daily repentance. Ultimately, the message is one of urgent hope: even those who have failed, like John Mark, can be restored and made useful through God's grace, and all are invited to turn from sin and embrace the saving gospel of Jesus Christ.