How does sin blind people to the truth?

Sin has a profound ability to blind individuals to the truth, as demonstrated in the case of King Herod in Mark 6. He was well aware of John's holiness and the truth of God’s law but chose to act according to his desires and the influence of his wife. This reflects a deeper spiritual blindness where an individual can acknowledge truth yet turn away from it. In 2 Corinthians 4:4, it states that the god of this age has blinded the minds of unbelievers, so they cannot see the light of the gospel. This blindness often manifests in self-righteousness, where individuals believe they are justified by their works or social standing, thus distancing themselves from the necessary humility and dependence on Christ for salvation.