Read Isaiah 44:18 Using Other Translations
They have not known nor understood: for he hath shut their eyes, that they cannot see; and their hearts, that they cannot understand.
They know not, nor do they discern, for he has shut their eyes, so that they cannot see, and their hearts, so that they cannot understand.
Such stupidity and ignorance! Their eyes are closed, and they cannot see. Their minds are shut, and they cannot think.