In biblical theology, the concept of the "heart" often represents the innermost being of a person, encompassing their will, emotions, intellect, and moral compass. The unregenerate heart, in particular, is described as being in a state of spiritual blindness, unable to perceive or understand the truths of God. This blindness is a result of sin and the fallen nature of humanity, which separates individuals from the divine light and truth.

The prophet Jeremiah poignantly describes the condition of the unregenerate heart: "The heart is deceitful above all things and beyond cure. Who can understand it?" (Jeremiah 17:9). This verse highlights the inherent deceitfulness and corruption of the heart without divine intervention. The unregenerate heart is not only blind but also resistant to the truth, often leading individuals away from God.

In the New Testament, the Apostle Paul further elaborates on this spiritual blindness. In his letter to the Corinthians, he writes, "The god of this age has blinded the minds of unbelievers, so that they cannot see the light of the gospel of the glory of Christ, who is the image of God" (2 Corinthians 4:4). Here, Paul identifies the influence of Satan, the "god of this age," as a key factor in the spiritual blindness of the unregenerate heart. This blindness prevents individuals from recognizing the glory and truth of the gospel message.

Jesus Himself addressed the issue of spiritual blindness in His teachings. In the Gospel of Matthew, He quotes the prophet Isaiah, saying, "For this people’s heart has grown callous; they hardly hear with their ears, and they have closed their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts, and turn, and I would heal them" (Matthew 13:15). This passage underscores the willful nature of spiritual blindness, as people choose to close their eyes and harden their hearts against the truth.

The unregenerate heart's blindness is not merely an intellectual deficiency but a moral and spiritual condition that requires divine intervention for healing. The Bible consistently points to the necessity of a new heart, a transformation that only God can accomplish. Ezekiel prophesies this divine promise: "I will give you a new heart and put a new spirit within you; I will remove your heart of stone and give you a heart of flesh" (Ezekiel 36:26). This transformation is essential for overcoming the blindness of the unregenerate heart and entering into a right relationship with God.

In summary, the unregenerate heart is characterized by spiritual blindness, a condition that hinders individuals from perceiving and accepting the truth of God's word. This blindness is a result of sin and the influence of Satan, and it requires the transformative power of God to be overcome. Through the renewal of the heart, individuals can move from darkness to light, from blindness to sight, and from death to life in Christ.Romans 1:21
Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.
Nave's Topical Index

Ephesians 4:18
Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart:
Nave's Topical Index

Regeneration the Work of God.
... An unregenerate person is deaf and blind; not only ... is corrupt or ruined, but an
unregenerate person is ... neighbors, but disposed, with all their heart, to love ...
/.../kuyper/the work of the holy spirit/xxi regeneration the work of.htm

The Deceitfulness of the Human Heart
... No unregenerate man, however sensible, ever so experienced, ever so ... breaks out in
the fullness of his heart: "Who would ... Yet is she blind, and ignorant of all: ...
/.../wesley/sermons on several occasions/sermon 123 the deceitfulness of.htm

Be not Deceived; God is not Mocked.
... foolishness." That is Christ's own statement regarding the unregenerate heart. ... every
one that is proud in heart is an ... to be safe, she kept her blind eye toward ...
/...//christianbookshelf.org/moody/sowing and reaping/chapter ii be not deceived.htm

The Thesis to be Proved
... the most part, he does good.6. But an unregenerate man is, not only he who is entirely
blind, ignorant of ... has the law of God written in his heart, and has ...
/.../arminius/the works of james arminius vol 2/i the thesis to be.htm

Christ's Prophetic Office
... Who but God can anoint the eyes of the blind, and give not ... The veil is upon his heart. ...
the darkness in which a sinner is, while in an unregenerate state, is ...
/.../christianbookshelf.org/watson/a body of divinity/3 christs prophetic office.htm

Persecution Every Christian's Lot
... an enemy of Caesar, and as such scourged, blind-folded, spit ... not sufficiently sensible
of the bitter enmity of the heart of every unregenerate man against ...
/.../selected sermons of george whitefield/persecution every christians lot.htm

Foundation of Moral Obligation.
... shocking and revolting, not only to the human heart, whether unregenerate or regenerate ...
it is impossible that this theory should not blind its advocates ...
/.../finney/systematic theology/lecture viii foundation of moral.htm

Whitefield -- the Method of Grace
... send upon a people in this world is to give them over to blind, unregenerate, carnal,
lukewarm ... an inward thing; you believe it to be a work of the heart, a work ...
/.../kleiser/the worlds great sermons volume 3/whitefield the method of.htm

Of the Nature of Regeneration, with Respect to the Change it ...
... acknowledge, that there are often, in unregenerate men, some ... love, which come warm
from a gracious heart, are always ... of animal nature, in any blind impulse, in ...
/.../doddridge/practical discourses on regeneration/discourse iii of the nature.htm

The Method of Grace
... upon a people in this world, is to give them over to blind, unregenerate, carnal,
lukewarm ... be an inward thing; you believe it to be a work in the heart, a work ...
/.../whitefield/selected sermons of george whitefield/the method of grace.htm

What is the Sacred Heart of Jesus? | GotQuestions.org

What does it mean to guard your heart? | GotQuestions.org

What is the heart? | GotQuestions.org

Heart: Dictionary and Thesaurus | Clyx.com

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