Romans 11:7 What then? Israel failed to obtain what it was seeking. The elect obtained it, but the rest were hardened, as it is written, “God gave them a spirit of stupor, eyes that would not see and ears that would not hear, down to this very day.” And David says, “Let their table become a snare and a trap, a stumbling block and a retribution for them; let their eyes be darkened so that they cannot see, and bend their backs forever.”
Isaiah 6:10 Make the heart of this people dull, and their ears heavy, and blind their eyes; lest they see with their eyes, and hear with their ears, and understand with their hearts, and turn and be healed.”
Matthew 13:14-15 Indeed, in their case the prophecy of Isaiah is fulfilled that says: “‘“You will indeed hear but never understand, and you will indeed see but never perceive.” For this people’s heart has grown dull, and with their ears they can barely hear, and their eyes they have closed, lest they should see with their eyes and hear with their ears and understand with their heart and turn, and I would heal them.’
2 Corinthians 4:4 In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God.
2 Thessalonians 2:10-12 and with all wicked deception for those who are perishing, because they refused to love the truth and so be saved. Therefore God sends them a strong delusion, so that they may believe what is false, in order that all may be condemned who did not believe the truth but had pleasure in unrighteousness.
How utterly bad is it to have rejected God and His love through Jesus Christ and then believe that which is nothing more than a delusion, lies, and unsatisfying to the soul? God reaches out in love to mankind with a gracious and merciful gift, Jesus Christ, and people have and continue to reject this offer. This offer has been flat out denied, neglected, diluted, or rejected, and it is in this state of mind they easily believe dilutions and lies. The saving grace knowledge of Jesus Christ is not so much withheld from them but rather they have blinded their eyes and deafened their ears with wanting to believe anything other than the Gospel of Jesus Christ. This is a personal intentional choice of rejection. With hardened hearts, they hear of God’s love through Jesus Christ but it has no effect. Though the Word of God shouts “Come to Me”, “Believe in Me”, “Trust Me”, “Rely on Me”, “Yield and surrender to Me”, “I love you so much I sent My Son to bear the burden of your sins”, “I will give you rest”, “I will give you joy, peace, power, courage, hope”, and “I will give you eternal life”, they choose to reject, deny, and neglect it. They choose to believe in the wisdom of man or self rather than the Creator. They choose to deny and reject God’s Word when it says; “I will judge you”, “I will pour out My wrath on you”, “I will not withhold my anger against you forever”, “I will cast you into eternal hell for eternity”, “I will reject all who have rejected Me”, “I am coming again to judge both the living and dead”, and “it is a dreadful thing to fall into the hands of an angry God and all of His fury”.
Rejection, denial, neglect, and complacency, take on many forms, at different times, but always display the intent of the heart, mind, and soul of people. All is exposed and open to God. He knows the intent of your heart and mind. He knows if you have surrendered all your hope of forgiveness for sin by faith, trust, and reliance in/on Jesus Christ alone. He knows if you keep some of this surrender back and by some means rely on some form of your good works or Christian service to help you become good in His eyes. This will never produce anything God-honoring because you are trying to keep some of this honor for yourself to somehow make you right in God’s eyes. It is just another delusion and lie. There is nothing you can do other than complete humble surrender, reliance, and trust in Jesus Christ. It is then and only then you will realize the good things you do are for the single purpose of honoring and glorifying Jesus Christ.