What does the Bible say about the believer's conduct?

In Ephesians 4:17-30, Paul emphasizes that believers should no longer walk in the ways of the world, characterized by a dead nature and empty mind. Instead, their new life in Christ should produce a transformed conduct. While believers will still struggle with sin, they should exhibit a changed attitude and actions that are aligned with their new identity in Christ. This change is a result of God’s grace at work in their hearts, leading them to live differently from the unbelievers who walk in darkness.