7 But I have yet somewhat more to say on this head. For not only, indeed, does the magnitude and beauty of the creation, but also the very manner of it, display a God who is the artificer of the universe. For since we were not present at the beginning, while he was engaged in the work of forming and creating all things; nor had we been present, could we have known how they came into being, the power that disposed them being invisible; He has made the mode of this creation to become our best teacher, by compounding all things in a manner which transcends the course of nature.
Perhaps what I have said, is not sufficiently clear. Therefore it is necessary that I should again repeat it in a clearer manner. All men, then, must admit that it is the course of nature for water to be supported on the earth, and not the earth on the waters. For the earth being a certain dense, hard, unyielding, and solid substance, is easily able to support the nature of water; but the water, which is fluid, and rare, and soft, and diffusive, and giving way to all it meets with, must be unable to support any solid body, though it were of the lightest kind.
Often indeed when a small pebble fails upon it, it yields, and makes way, and sends it down to the bottom. When therefore you behold not a small pebble, but the whole earth borne upon the waters, and not submerged, admire the power of Him who wrought these marvellous things in a supernatural manner! And whence does this appear, that the earth is borne upon the waters? The prophet declares this when he says, “He has founded it upon the seas, and prepared it upon the floods.” And again: “To him who has founded the earth upon the waters.” What do you say?
The water is not able to support a small pebble on its surface, and yet bears up the earth, great as it is; and mountains, and hills, and cities, and plants, and men, and brutes; and it is not submerged! What do I say? Is not submerged? How comes it to pass, that since the water has been in close contact with it below, during so long a period, it has not been dissolved, and the whole of it become mud? For the substance of wood, when soaked in water but a little time, is rotted and dissolved; and why do I say of wood?
What can be firmer than iron? Yet often this is softened, when it remains a long time in water; and well it may. For it derives its substance from the earth. Therefore many run-away servants, when they make their escape, dragging their shackles and chains along with them, go to brooks of water, and thrust their shackled feet therein, and after making the iron softer by this means, they easily break it by striking it with a stone. Iron, forsooth, is softened, and wood is rotted, and stones are worn away by the nature of water; yet so great a mass as the earth has remained such a length of time lying upon the waters, without being either submerged, or dissolved, and destroyed!
Source: Homilies on the Statues (New Advent)