We have much to say about this, but it is hard to make it clear to you because you no longer try to understand.
NIV
Concerning this we have much to say which is hard to explain, since you have become dull in your [spiritual] hearing and sluggish [even slothful in achieving spiritual insight].
AMP
Of whom we have many things to say, and hard to be uttered, seeing ye are dull of hearing.
KJV
"Make the heart of this people calloused; make their ears dull and close their eyes. Otherwise they might see with their eyes, hear with their ears, understand with their hearts, and turn and be healed."
NIV
Make the heart of this people fat; and make their ears heavy and shut their eyes, lest they see with their eyes and hear with their ears and understand with their hearts and turn again and be healed.
AMP
Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed.
KJV
But their minds were made dull, for to this day the same veil remains when the old covenant is read. It has not been removed, because only in Christ is it taken away.
NIV
In fact, their minds were grown hard and calloused [they had become dull and had lost the power of understanding]; for until this present day, when the Old Testament (the old covenant) is being read, that same veil still lies [on their hearts], not being lifted [to reveal] that in Christ it is made void and done away.
AMP
But their minds were blinded: for until this day remaineth the same vail untaken away in the reading of the old testament; which vail is done away in Christ.
KJV
"He has blinded their eyes and hardened their hearts, so they can neither see with their eyes, nor understand with their hearts, nor turn – and I would heal them."
NIV
He has blinded their eyes and hardened and benumbed their [callous, degenerated] hearts [He has made their minds dull], to keep them from seeing with their eyes and understanding with their hearts and minds and repenting and turning to Me to heal them.
AMP
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.
KJV
"Are you so dull?" he asked. "Don't you see that nothing that enters you from the outside can defile you?"
NIV
And He said to them, Then are you also unintelligent and dull and without understanding? Do you not discern and see that whatever goes into a man from the outside cannot make him unhallowed or unclean
AMP
And he saith unto them, Are ye so without understanding also? Do ye not perceive, that whatsoever thing from without entereth into the man, it cannot defile him;
KJV