For this people's heart has become gross, and their ears are dull of hearing, and their eyes they have closed; lest at any time they should see with their eyes and hear with their ears, and should understand with their heart, and should be converted, and I should heal them.
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Theophylact of Ochrid
AD 1107
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Do you see what the prophecy (Is. 6:9-10) is saying? You do not understand, not because I created your heart fat and dull, but because it has grown fat, although it is obvious that before it was fine and subtle. For something which grows fat was first thin. And when their heart had grown fat, then they closed their eyes. He did not say that God closed their eyes, but they did, of their own choice. They did this, He says, so that they would not turn back and be healed by Me. For they chose evil and went to great lengths to remain unhealed and unrepentant.