For he has founded it upon the seas, and established it upon the floods.
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Augustine of Hippo
AD 430
2. "The earth is the Lord's, and the fulness thereof, the compass of the world, and all they that dwell therein" (ver. 1); when the Lord, being glorified, is announced for the believing of all nations; and the whole compass of the world becomes His Church. "He hath founded it above the seas." He hath most firmly established it above all the waves of this world, that they should be subdued by it, and should not hurt it. "And hath prepared it above the rivers" (ver. 2). The rivers flow into the sea, and men of lust lapse into the world: these also the Church, which, when worldly lusts have been conquered by the grace of God, hath been prepared by love for the reception of immortality, subdues.
Founded, or created it (Berthier) upon (Hebrew hal. "above, in, near, to, with"; Amama) the seas, like a floating island, Proverbs viii. 29., Jonas ii. 7., Job xxxviii. 11. This was the language of the ancients: Ipsa natat tellus Pelagi lustrata corona. (Manil. Astr. 4.) The earth was at first covered with water, Genesis i. 9., and Psalm ciii. 6. (Calmet)
Seas and caverns have received part of it, which was poured out again at the deluge. Several have rejected the antipodes, falsely supposing that there is water all under the earth, which the Scripture does not assert. (Amama) (Haydock)