John 6:44

They have not known nor understood: for he hath shut their eyes, that they cannot see; and their hearts, that they cannot understand. And none considereth in his heart, neither is there knowledge nor understanding to say, I have burned part of it in the fire; yea, also I have baked bread upon the coals thereof; I have roasted flesh, and eaten it: and shall I make the residue thereof an abomination? shall I fall down to the stock of a tree? He feedeth on ashes: a deceived heart hath turned him aside, that he cannot deliver his soul, nor say, Is there not a lie in my right hand?

Can the Ethiopian change his skin, or the leopard his spots? then may ye also do good, that are accustomed to do evil.

O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.

How can ye believe, which receive honour one of another, and seek not the honour that cometh from God only?

And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.

Why do ye not understand my speech? even because ye cannot hear my word.

But though he had done so many miracles before them, yet they believed not on him: That the saying of Esaias the prophet might be fulfilled, which he spake, Lord, who hath believed our report? and to whom hath the arm of the Lord been revealed? Therefore they could not believe, because that Esaias said again, He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.

Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be.