Why is repentance essential for believers?

Repentance is essential for believers because it reflects a true understanding of one's sin against God and the need for His grace. In Matthew 11:20, Jesus rebukes the cities for their lack of repentance, implying that genuine repentance is a crucial response to the revelation of His works and character. True repentance involves recognizing our sinfulness, turning away from self-reliance, and clinging to Christ’s righteousness for salvation. This change of mind is only possible through God's sovereign grace, as He grants the ability to repent.