What does the Bible say about man's nature?

Genesis 6:5 describes the sinful state of humanity, stating that every imagination of the thoughts of man's heart was only evil continually. This verse emphasizes the depth of human depravity and the pervasive nature of sin following Adam's fall. The heart, as the center of our being, is not only the source of our actions but is intrinsically wicked and deceitful, as demonstrated in scripture. The prophet Jeremiah affirms this by declaring that the heart is deceitful above all things and desperately wicked, highlighting that without divine intervention, humanity is destined to remain in this state of rebellion against God.