Charles Ellicott Commentary Isaiah 6:10

"Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they sea with their eyes, and hear with their ears, and understand with their heart, and turn again, and be healed." — Isaiah 6:10 (ASV)

Make the heart of this people fat. —The thought is the same as that of the “hardening” of Pharaoh’s heart (Exodus 8:19; Exodus 9:34, and following) and that of Sihon (Deuteronomy 2:30). It implies the reckless, headstrong will that defies restraint and warnings.

So the poets of Greece, in their thoughts regarding the Divine government of the world, recognized the truth that there is a judicial blindness and, as it were, insanity of will that comes as the consequence of sinful deeds (Æsch. Agam. 370-386). The medieval adage, “ Quem Deus vult perdere prius dementat,” expresses one aspect of the same law; but the vult perdere is excluded by the clearer revelation of the Divine purpose (Ezekiel 18:23; 1 Timothy 2:4; 2 Peter 2:9), as He is not willing that any should perish.

Shut their eyes. —Literally, as in Isaiah 29:10, daub, or besmear. Possibly the phrase refers to the barbarous practice, not unknown in the East, of thus closing the eyes as a punishment. Burder (Oriental Customs, i. 98) mentions a son of the Great Mogul who was thus punished by his father. For the ethical fact, as well as for the phrase, we may (with Cheyne) compare Shakespeare—

“For when we in our viciousness grow hard,
Oh, misery on it, the wise gods seal our eyes.”