Psalms 104:6

6.He hath covered it with the deep as with a garment, This may be understood in two ways, either as implying that now the sea covers the earth as a garment, or that at the beginning, before God by his omnipotent word held gathered the waters together into one place, the earth was covered with the deep. But the more suitable sense appears to be, that the sea is now the covering of the earth. At the first creation the deep was not so much a garment as a grave, inasmuch as nothing bears less resemblance to the adorning of apparel than the state of confused desolation and shapeless chaos in which the earth then was. Accordingly, in my judgment, there is here celebrated that wonderful arrangement by which the deep, although without form, is yet the garment of the earth. But as the context seems to lead to a different view, interpreters are rather inclined to explain the language as denoting, That the earth was covered with the deep before the waters had been collected into a separate place. This difficulty is however easily solved, if the words of the prophet, The waters shall stand above the mountains, are resolved into the potential mood thus, The waters would stand above the mountains; which is sufficiently vindicated from the usage of the Hebrew language. I have indeed no doubt that the prophet, after having said that God had clothed the earth with waters, adds, by way of exposition, that the waters would stand above the mountains, were it not that they flee away at God’s rebuke. Whence is it that the mountains are elevated, and that the valleys sink down, but because bounds are set to the waters, that they may not return to overwhelm the earth? The passage then, it is obvious, may very properly be understood thus, — that the sea, although a mighty deep, which strikes terror by its vastness, is yet as a beautiful garment to the earth. The reason of the metaphor is, because the surface of the earth stands uncovered. The prophet affirms that this does not happen by chance; for, if the providence of God did not restrain the waters, would they not immediately rush forth to overwhelm the whole earth? He, therefore, speaks advisedly when he maintains that the appearance of any part of the earth’s surface is not the effect of nature, but is an evident miracle. Were God to give loose reins to the sea, the waters would suddenly cover the mountains. But now, fleeing at God’s rebuke, they retire to a different quarter. By the rebuke of God, and the voice of his thunder, is meant the awful command of God, by which he restrains the violent raging of the sea. Although at the beginning, by his word alone, he confined the sea within determinate bounds, and continues to this day to keep it within them, yet if we consider how tumultuously its billows cast up their foam when it is agitated, it is not without reason that the prophet speaks of it, as kept in check by the powerful command of God; just as, both in Jeremiah, (Jeremiah 5:22) and in Job, (Job 28:25) God, with much sublimity, commends his power, as displayed in the ocean. The ascending of the mountains, and the descending of the valleys, are poetical figures, implying, that unless God confined the deep within bounds, the distinction between mountains and valleys, which contributes to the beauty of the earth, would cease to exist, for it would engulf the whole earth. It is said that God has founded a place for the valleys; for there would be no dry land at the foot of the mountains, but the deep would bear sway, did not God command the space there to be unoccupied by the sea, as it were contrary to nature.