What does the Bible say about human wickedness?

According to 1 John 5:19, the whole world lies in wickedness, indicating a pervasive moral corruption inherent in human nature. This concept is central to the Reformed understanding of depravity, which posits that all humans, by nature, have turned away from God. The biblical narrative consistently portrays humanity's wickedness and moral failures, emphasizing that apart from God's grace, individuals cannot escape their sinful inclinations. The acknowledgment of this wickedness serves as a foundation for understanding the necessity of redemption through Christ.