And Moses stretched forth his hand toward heaven; and there was a thick darkness in all the land of Egypt three days:
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Isodore of Seville
AD 636
In the ninth plague, darkness fell. Either it means the blindness of their minds or that they should realize that the workings of the divine economy and of providence are most obscure. For God made darkness his hiding place. But they desired boldly and rashly to investigate it and, drawing one conclusion after another, fell into the dense and palpable darkness of ignorance. Questions on the Old Testament, Exodus