Christian Living: Put Off the Old Self, Put On the New Self

The sermon opens by reviewing the previous week's theme of the inner battle between the old self before faith and the new self after faith, grounded in Ephesians 4:22-24 and Colossians 3:9-10. The pastor explains that transformation after trusting Christ does not happen instantly or completely in a single day, because each person's old self carries different personalities, backgrounds, and histories. Just as a war consists of many individual battles, the inner battle of every believer varies in intensity and duration depending on temperament, family context, and depth of understanding of God's Word.

A significant portion of the sermon contrasts the change promised in Scripture with what psychology and science can offer. The pastor recounts the story of a Christian student at Harvard who challenged a psychology professor: science can diagnose a psychological condition but cannot change the heart. Only faith and religion carry the authority to tell a person they need to become different, to turn from sin toward holiness and righteousness. This distinction separates genuine spiritual transformation from all worldly self-improvement programs.

To guarantee lasting change for His people, God provides four priceless gifts: first, Jesus Christ as the living model to imitate, the One who intercedes continuously and from whose love nothing can separate believers (Romans 8:33-39); second, the Holy Spirit as the Comforter who dwells within every believer, teaching, reminding, convicting, and disciplining (John 14:16-18, 26); third, the Scripture as the sufficient and complete guide for the Christian life in every circumstance (2 Timothy 3:16); and fourth, the Church as the spiritual family where believers encourage one another, practice love, patience, and forgiveness together (Proverbs 27:17, Matthew 18:15-17). Alongside these four gifts, God also provides the firm assurance that He will not allow His people to be tempted beyond what they can bear, but will always provide a way of escape so they can endure (1 Corinthians 10:13).

The central section of the sermon unpacks the three steps of change in Ephesians 4:22-24. Putting off the old self means ceasing specific sinful habits such as stealing or harmful speech. However, the pastor stresses that stripping away the old without putting on the new is dangerous, illustrated by the parable of the empty house in Matthew 12:43-45, where an evil spirit returns with seven spirits more wicked than itself. Therefore, a thief must not only stop stealing but must work honestly and give to those in need; one who spoke harmful words must not merely go silent but replace them with words that build others up (Ephesians 4:28-29).

The final section focuses on the most critical element: allowing God to renew the mind. The pastor uses the image of a floating iceberg: the part above water represents visible words and actions, while the submerged part represents thoughts, desires, motivations, and the deep inclinations of the heart that only the Holy Spirit can change at the root. Through examples from the lives of Jacob, David, and Michal, the sermon concludes that the true and lasting motivation for change comes when the Holy Spirit transforms the deepest longings of the heart, so that believers both desire and act according to God's good purposes (Philippians 2:13).