What does the Bible say about the innate sin nature of man?

Scripture reveals that humanity inherits an innate sin nature from Adam, leading to wicked actions and self-centered attitudes, as seen in Romans 5:12, where it states that sin entered the world through one man. The effects of this sinful nature are prevalent and insidious, often going undetected by many who seek to address only its symptoms rather than the root cause. This is illustrated through the metaphor of various doctors, representing false remedies that cannot heal the spiritual malady of sin. No human wisdom or effort can cure this disease, making the recognition of our plight essential for understanding the need for Christ's redemption.