The waters saw thee, O God, the waters saw thee: and they were afraid, and the depths were troubled.

“This is not the only example of the obedience of water available to us, for elsewhere we find it written, "The waters saw you, O God; the waters saw you, and they were afraid." What is said here of the waters does not seem to be without a semblance of truth, since elsewhere the prophet also speaks in the same manner: "The sea saw and fled; Jordan was turned back." Who does not know how in actual fact the sea fled at the crossing of the Hebrews? When the waters were divided, the people crossed over, believing because of the dust under their feet that the sea had fled and that the waters had vanished. Therefore, the Egyptian believed what he saw and entered in, but the waters that had fled returned for him. The waters, then, know how to gather, how to fear and how to flee, when commanded to do so by God. Let us imitate these waters, and let us recognize one congregation of the Lord, one church.”

“And he continues how? "The waters have seen You, O God, and they have feared and the abysses have been troubled" [Psalm 77:16]. What are the waters? The peoples. What are these waters has been asked in the Apocalypse, [Revelation 17:15] the answer was, the peoples. There we find most clearly waters put by a figure for peoples. But above he had said, "You have made known in the peoples Your virtue." With reason therefore, "the waters have seen You, and they have feared." They have been changed because they have feared. What are the abysses? The depths of waters. What man among the peoples is not troubled, when the conscience is smitten? You seek the depth of the sea, what is deeper than human conscience? That is the depth which was troubled, when God redeemed with His arm His people. In what manner were the abysses troubled? When all men poured forth their consciences in confession.”

“The clouds poured out water,.... This, with some other circumstances which follow, are not related by Moses in the history of this affair; but as they are here recorded by an inspired penman, there is no doubt to be made of the truth of them; besides Josephus (a) relates the same things; he says, that at the time when the Egyptians were drowned in the Red sea, rains descended from heaven, and there were terrible thunders, lightnings, and thunderbolts; this was when the Lord looked through the cloud, and troubled the host of the Egyptians, Exo 14:24, the skies sent out a sound; or the airy clouds, the lighter ones, and which were higher in the heavens, as the others before mentioned were thick clouds, full of water, and hung lower; these were thunderclouds, and thunder is the sound which they sent forth, as in the following verse: thine arrows also went abroad: that is, lightnings, as in Psa 18:14, so Aben Ezra; but Kimchi interprets them of hailstones. (a) Antiqu. l. 2. c. 16. sect. 3.”

“Afraid. St. Jerome, “in labour.” (Haydock) — Troubled. The dry land appearing, to let the Israelites pass. (Berthier) (Psalm cxiii. 3.) — St. Jerome and the Jews understand this of the storm of Sinai. But most people suppose that the catastrophe at the Red Sea is described, when Moses insinuates, that a dreadful tempest overwhelmed the Egyptians, as it is here specified. See Josephus, [Antiquities?] ii. 7. (Calmet)”