John Chrysostom
"By faith they passed through the Red Sea as on dry land." Again he compares an entire people with an entire people, so that we may not say that we cannot be saints. "By faith," he says, "they passed through the Red Sea as on dry land, which the Egyptians attempted and were drowned." Here he brings the Egyptian calamities to their remembrance. How was this "by faith"? They hoped to pass through the sea and prayed for it, or rather, Moses prayed. Do you see how faith always surpasses human reasoning, weakness, and nothingness? Do you see that as soon as they believed, they were delivered from calamity, both at the anointing of the doors with blood and at the Red Sea? Clearly this was water, since the Egyptians entered it and drowned. Therefore it was not an apparition, but reality.
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As those torn by lions and burned in the furnace prove that the events were real, so here a real event is visible. It served for some as glory and salvation, and for others as destruction. See what a great good faith is. It saves us even when we come into a position with no way out, when death itself threatens us, and when our circumstances are desperate. Indeed, what remained for them to do then? The Egyptians and the sea surrounded them unarmed. They had either to flee and drown, or fall into the hands of the Egyptians. But faith saved them from this hopeless situation. The water spread out before them like dry land, but drowned the others like a sea. For them it forgot the laws of nature, but against the others it armed itself.