2 Corinthians 4:4 The enemy, who is the god of this world, has blinded the minds of those who don't believe. They are unable to see the glorious light of the Good News. They don't understand this message about the glory of Christ, who is the exact likeness of God.
Matthew 13:16 But blessed are your eyes because they see, and your ears because they hear.
Romans 8:7-8 the sinful mind is hostile to God. It does not submit to God's law, nor can it do so.
Matthew 15:14 And if a blind man guides a blind man, both will fall into a pit. .... They pretend to be spiritual guides of the people, while spiritually blind themselves. ... out his hand, he who helps will stumble, he who is helped will fall; both will perish together.