Deuteronomy 29:2-6

Moses called all the Israelites together and said to them: You have seen everything the LORD did before your own eyes to the king of Egypt and to the king’s leaders and to the whole country. With your own eyes you saw the great troubles, signs, and miracles. But to this day the LORD has not given you a mind that understands; you don’t really understand what you see with your eyes or hear with your ears. I led you through the desert for forty years, and during that time neither your clothes nor sandals wore out. You ate no bread and drank no wine or beer. This was so you would understand that I am the LORD your God.