They have not known nor understood,.... Who the true God is, nor the worship that is due to him alone; they do not know nor understand divine and spiritual things; nay, they have not the knowledge and understanding of men; they want common sense that can do and say such things as before mentioned, both idol makers and idol worshippers:
for he hath shut their eyes that they cannot see, and their heart that they cannot understand; either the devil, as some think, the god of this world, that blinds their eyes from seeing the folly of such gross idolatry, which he, deceiving them, leads them into; or rather God himself, who, because they like not to retain him in their knowledge, gives them up to a reprobate and injudicious mind, to believe a lie, and worship a false god; this he permits, orders, and overrules to some good ends and purposes: this is to be understood of the eyes of the understanding, which, as the word i signifies, are "daubed" and plastered over, that there is no opening of them, and seeing with them; which is the judicial blindness and hardness of heart, which God sometimes in righteous judgment gives up men unto; see Romans 1:28.
i תח עיניהם "oblevit oculos eorum", Montanus; "obleverit", Cocceius; "quod [sculptile] oblinat", Piscator.