1 Corinthians 2:14 The natural person does not accept the things of the Spirit of God, for they are folly to him, and he is not able to understand them because they are spiritually discerned.
Matthew 13:11-17 And he answered them, “To you it has been given to know the secrets of the kingdom of heaven, but to them it has not been given. For to the one who has, more will be given, and he will have an abundance, but from the one who has not, even what he has will be taken away. This is why I speak to them in parables, because seeing they do not see, and hearing they do not hear, nor do they understand. 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.’ But blessed are your eyes, for they see, and your ears, for they hear. For truly, I say to you, many prophets and righteous people longed to see what you see, and did not see it, and to hear what you hear, and did not hear it.
Romans 8:5-8 For those who live according to the flesh set their minds on the things of the flesh, but those who live according to the Spirit set their minds on the things of the Spirit. For to set the mind on the flesh is death, but to set the mind on the Spirit is life and peace. For the mind that is set on the flesh is hostile to God, for it does not submit to God’s law; indeed, it cannot. Those who are in the flesh cannot please God.
The natural man – one who lives in a natural state, and under the influences of these natural passions, lives in opposition to things of God and things taught by and through the Holy Spirit. Instead of living with knowledge and understanding, they live void of God. They have blocked their own eyes from seeing and their ears from hearing things of God. Their heart has become like a stone to things of God. They choose to live in this state of blindness and deafness. Everything they do is void of doing it for the honor and glory of God. Even the good that they do is done out of selfish desires. All of us were born in the natural state, with natural desires, and lives that were in opposition to and void of understanding things of God. There is not a single person who can claim a birth other than this. “For all have sinned and fall short of the Glory of God”
The amazing and awesome Good News of Jesus Christ is that, in the grace, mercy, and love of God, He made a way, a mystery, for us to have a “New Birth”, “Born Again”, “A New Creation”. This mystery can not be understood or found by the wisdom and understanding of the natural man. The heart and mind of the natural man are void of this understanding. Somehow, God, is able to soften the heart and mind of the natural man with the “Good News of the Gospel of Jesus Christ. I have no comprehension of how this works, but I know the most stone-hardened heart can be changed by hearing the Good News. I was lost but now am found, I was blind but now I see, I was deaf but now I hear. Somehow the Gospel penetrates through the hardness and the heart and mind are able to understand the Gospel. At that moment, in that very second, that person makes an intentional choice to believe it or reject it. In that very moment a once hardened heart, that intentionally chooses to believe, trust, and rely on Jesus Christ, is changed and is “Born Again”, becomes a “New Creation”, and is a “New Birth”.
Everyone will make an intentional decision to believe and trust God or to reject deny or reject Him before they die. In this decision, they choose eternity in heaven or eternity in hell. There ought to be a difference in how the lives are lived of those that are “Born Again” compared to those who are spiritually void.