If the Good News we preach is hidden to anyone, it is hidden from the one who is on the road to eternal death. Satan, who is the god of this evil world, has made him blind, unable to see the Glorious Light Of The Gospel that is shining upon him or to understand the Amazing Message we preach about The Glory Of Christ, who is God.
II Corinthians 4:3-4 (TLB)

But whenever someone turns to The Lord, the veil is taken away.
II Corinthians 3:16 (NLT)

Jesus spoke to the people once more and said, “I AM The Light Of The World. If you follow Me, you won’t have to walk in darkness, because you will have The Light that leads to Life.”
John 8:12 (NLT)