in whose case the god of this world has blinded the minds of the unbelieving so that they might not see the light of the gospel of the glory of Christ, who is the image of God.2 Corinthians 4:4(NASB)
In context, Paul is talking about the glories of the New Covenant of God. He is rejoicing in the wonderful promises that are founded on the blood of Christ – the gospel that removes all who believe on the Lord Jesus Christ from the condemnation of the Law, for the free gift of God is eternal life to all who believe on Christ. Because of the glories of the wonderful gospel of Christ, where the life and light of salvation flows to all who believe, Paul rejoices to teach the good news of God's saving grace and to set out the truth of Scripture because he knew that it was only by God's grace that he himself had been saved. Because of the glories contained in the gospel of Christ, Paul does not get discouraged, even when those that he is teaching choose not to listen to the good news, but reject the truth of God's amazing grace.
Paul knew that there was a reason that many refused to listen to the gospel of God's grace. He knew that although they had heard the truth, they had renounced it. Although they had heard the gospel, they chose not to believe it. Although they had been given an opportunity to accept it, they had chosen to reject the truth of the glorious gospel of Christ. And when people hear the gospel and then willingly reject it, they unwittingly give the god of this world a foothold in their mind - and as a result their unbelief becomes more and more firmly established in their hearts, until their minds are blinded to the glorious truth of the gospel of God's grace.
It is not God's will that anyone should perish, but that all come to a saving knowledge of the Lord Jesus – but God gives every single man and woman a choice to believe on the Lord Jesus Christ and be saved or to reject the gospel of grace and be condemned. Men and women who choose to close their minds to the gospel of God's grace are those that are perishing.
Those that choose to disbelieve the gospel of grace are called unbelievers and have placed themselves under condemnation because they have not believed on the only begotten Son of God. The more one rejects the glories of the wonderful gospel of Christ, where the life and light of salvation flows to all who believe, the more hardened their hearts become, and the more the god of this age is able to blind their minds. Those that are perishing (whose eyes have been blinded by the god of this age), are perishing by their own freewill choice.
Day by day, let us be those that continue to rejoice in the wonderful gospel of Christ, for the more we open our hearts to Him, the more He will show Himself to us.
Father, I thank You that You sought me and found me. Keep my heart ever open to Your truth. I pray that many who hear the gospel today, will open their hearts to Your truth of the new covenant of grace and trust the Lord Jesus as Saviour. In His name I pray, AMEN.