Spiritual blindness is a very common problem in our society.
God knew beforehand the condition of the hearts of the people on the earth, and unveiled a plan to remedy the hearts blindness.
That plan was Jesus Christ crucified, to restore spiritual sight to the heart veiled to the Gospel by unbelief.
                                                 Page #'s  64-67 of my book Are You Saved or Deceived? as follows;
       2 Corinthians 4:3-4 “And even if our Gospel is veiled, it is veiled to those who are perishing, in whose case the god of this world has blinded the minds of the unbelieving, that they might not see the light of the gospel of the glory of Christ, who is the image of God.”
Allowing God to change your heart from unbelief to faith begins with changing your mind and making a decision in your heart to believe. Whether you understand everything fully right now about His will for your life doesn’t matter. This is God you are dealing with and even in your whole lifetime, you won’t understand everything about Him. Just take that first step and believe the gospel. When you do, then God will remove the veil of darkness that has blinded your mind from seeing the truth of the Gospel.
      2 Corinthians 3:13-18 speaks of the sons of Israel who had remained hardened in their minds, which had kept them blind (or veiled) to the gospel. This passage is so obvious that turning your heart to the Lord removes the veil. Turning your heart to the Lord removes your blindness. If you are a son of Israel, God would desire that you experience His glory. The key to intimacy with Him is to believe in His Son Jesus Christ, The Messiah, who by God’s divine plan was born of a virgin and died for the sins of the whole world, to bring us into the fellowship of His light and freedom. It is of great importance that you believe the scriptures that teach about the virgin birth of Jesus Christ. The virgin birth Christ is a very central theme of the Bible and is important in helping us understanding how and why Jesus made claims of equality with God, His Father.
Perhaps this is what had created such an obvious root of unbelief in the hearts of the religious leaders in the time of Christ. Though Jesus claimed to be God, they simply believed that He was a mere man, the son of a carpenter named Joseph. He came to His own and His own received Him not. Had they received Jesus as Messiah, Isaiah 53 would be false prophecy. God came down to live among us in the form of a man named Jesus, born in perfection by the Holy Spirit, lived a perfect life without sin and was crucified by the shedding of His perfect unblemished blood on a cross to accomplish our redemption. Had He not been perfect God and perfect man, His death would have been in vain.
If you are not yet born again and have not invited Jesus Christ to abide in your heart and life, these truths may seem out of reach to you if indeed your heart is still in darkness. If that is where your heart is, that is where Satan would desire to keep you trapped. This is a huge matter of deception when you think you do not need God’s word or you see no need to have your heart exposed to His light.

      Titus 2:11-14  For the grace of God has appeared, bringing salvation to all men, instructing us to deny ungodliness and worldly desires and to live sensibly, righteously and godly in the present age,  looking for the blessed hope and the appearing of the glory of our great God and Savior, Jesus Christ; who gave Himself for us, that He might redeem us from every lawless deed and purify for
Himself a people for his own possesion, zealuos for good deeds.