This sermon examines Jesus' teaching in Matthew 5 on the seventh commandment, exposing the inward sin of lust as equivalent to adultery. The preacher argues that true righteousness requires a radical mortification of sin, urging believers to take drastic measures to remove temptations from their lives. Rather than relying on self-effort or superficial fixes, the message emphasizes that holiness is found only through dependence on Christ and the Holy Spirit. By confronting the destructive nature of sexual sin and the futility of hiding behind 'fig leaves,' the sermon directs listeners to find hope and purity in the finished work of Jesus. Ultimately, it calls for a heart transformation where believers gaze upon Christ's beauty rather than forbidden desires.