'Reason' in the Bible

Yahweh did so; and there came grievous swarms of flies into the house of Pharaoh, and into his servants' houses: and in all the land of Egypt the land was corrupted by reason of the swarms of flies.

It happened, when Moses came down from Mount Sinai with the two tablets of the testimony in Moses' hand, when he came down from the mountain, that Moses didn't know that the skin of his face shone by reason of his speaking with him.