Why is understanding spiritual blindness important for Christians?

Understanding spiritual blindness is crucial for Christians because it highlights the inherent depravity and lostness of humanity apart from God's intervention. Saul, before his conversion, believed himself to be righteous yet was oblivious to his spiritual condition. This illustrates the biblical truth that by nature, all are lost and blind, as referenced in 2 Corinthians 4:3-4, where the gospel is hidden to those who are perishing. The acknowledgment of one's spiritual blindness fosters humility and reliance on God's grace for salvation. It also encourages believers to share the gospel, understanding that they too were once blind but have been made alive in Christ by His grace.