Mike's application of the hardening diagnosis. "Blindfolded Mind" is a concrete picture: a blindfold on the mind.
John 12:40 (quoting Isaiah): "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."
In the Greek original it is tetýphlōken (τετύφλωκεν), "he has blinded" (perfect tense of typhlóō). That is a hard statement: the blinding can be allowed by God as the consequence of repeated rejection of the truth.
Mike's track is confrontation with one's own hardening. There is the phrase "willful ignorance", intentional unknowing. That is Mike's diagnosis: many Christians are not unbelieving, they are willfully blind.
Practically: where have you put on a blindfold? Which truth do you not want to see? Honest answer is the beginning of healing. Mike's sound carries this self-examination with sharp clarity.