Unbelievers unable to see light of the Gospel

Scripture reference

2 Corinthians 4:3–7 (ASV)

3And even if our gospel is veiled, it is veiled in them that perish: 4in whom the god of this world hath blinded the minds of the unbelieving, that the light of the gospel of the glory of Christ, who is the image of God, should not dawn upon them. 5For we preach not ourselves, but Christ Jesus as Lord, and ourselves as your servants for Jesus’ sake. 6Seeing it is God, that said, Light shall shine out of darkness, who shined in our hearts, to give the light of the knowledge of the glory of God in the face of Jesus Christ.

7But we have this treasure in earthen vessels, that the exceeding greatness of the power may be of God, and not from ourselves;

Stories

During the years that communist governments were prevalent in Europe and most Christians were underground, the KGB kept searching for Gennadi but they could not locate him. They hired a top medium from India who confessed that he could not locate Gennadi because he was protected by light. It was the Light of Christ.
For some of the ruling officials and Confucian literati, the message of Christianity made no sense. How the “Heaven-Father let his son come on earth and die for wicked people" was a concept they never could understand. And unable to see the Light of the gospel themselves, they persecuted those who did.