What does the Bible say about the heart of man and sin?

Jeremiah 17:9 tells us that 'the heart is deceitful above all things and desperately wicked; who can know it?' This highlights the intrinsic sinfulness of humanity, as reflected in Judges 17:6, where it states that 'in those days there was no king in Israel; everyone did what was right in his own eyes.' This demonstrates the anarchy of sin when Christ is not the ruler of the heart. Without divine intervention, the natural heart leads to rebellion and idolatry, showcasing our need for a Savior who can deliver us.