Was it because they were born Totally Depraved and thus by nature unable to see, hear, understand and turn to God for healing? ORRRRRR
"For this reason they could not believe, because, as Isaiah says elsewhere: "He has blinded their eyes and deadened their hearts, so they can neither see with their eyes, nor understand with their hearts, nor turn--and I would heal them." John 12:39
What? Nothing about an inborn nature?
Please understand that not all doctrines are summed up in one Scripture.
The doctrine of man’s sin nature and the resulting negative effects of it are taught throughout the Bible in various passages, all of which have been quoted in this forum, I am sure.
The Scripture in question refers to an extraordinary unbelief despite supernatural signs and wonders which should have at least caused a ‘reasonable person’ to reassess one’s negative view of Christ.
But alas, sin does not enable right, rational thinking.
Furthermore, the Lord has declared His right to harden – increase unbelief --- despite their viewing Jesus’ extraordinary miracles.
“Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.”
Consider the raising of Lazarus.
This mighty miracle, which should have proved to reasonable men that Jesus is God, caused the Pharisees to plot Jesus’ death.
And let’s not forget their desire to also kill Lazarus.
Such hardening is the certainty of eternal damnation.
Such hardening is the willful judicial act of God as Judge.
By it, God has done no wrong.
Please understand that the Lord did not harden those who were sinless.
He does not turn a saint into a sinner.
Rather, He is in the business of turning sinners into saints.
In the future I will be posting a treatise called: “The Equal Ultimacy of Election and Reprobation.”
I’m sure you will have much to say about it.