Why is the gospel essential for overcoming sin?

According to Bunyan, the gospel plays a vital role in overcoming sin and internal corruption. In the allegory, the maid sprinkling water represents the gospel's transformative power. While the law reveals sin and increases its strength, the gospel provides grace that cleanses and liberates the heart from the bondage of sin (Ephesians 2:8-9). Grace is essential because it shifts the believer's dependence from self to Christ, ensuring that the believer is preserved despite the devil's attempts to quench their faith.