What does the Bible say about sin nature?

According to Scripture, every human inherits a sin nature from Adam, which manifests as a festering sore that leads to self-centeredness and turmoil. This is underscored in Romans 7:18-19, where Paul expresses the struggle with sin as a law present in his flesh. The sin nature is not merely the actions of wrongdoing but a deep-rooted condition of enmity against God, leading to physical and spiritual death without divine intervention. This affliction is universal, affecting every individual born of Adam, illustrating the total depravity inherent to mankind.