What does the Bible say about the deceitful heart?

Jeremiah 17:9 states, 'The heart is deceitful above all things, and desperately wicked; who can know it?' This verse underlines the natural condition of humanity, indicating that apart from divine intervention, our hearts are inclined toward deceit and wickedness. The context of this scripture reflects humanity's dependence on God's revelation for understanding salvation and a right relationship with Him. Without God's grace, we rely on our flawed perceptions, steering us away from the truth of the gospel.