You did divide the sea by your strength: you broke the heads of the serpents in the waters.
Read Chapter 74
Augustine of Hippo
12. Now therefore, O Asaph, amend thyself according to thy understanding, tell us what sort of Salvation God hath wrought in the midst of the earth. When that earthly Salvation of yours was overthrown, what did He do, what did He promise? "Thou didst confirm in Thy virtue the sea" (ver. 13). As though the nation of the Jews were as it were dry land severed from the waves, the Gentiles in their bitterness were the sea, and on all sides they washed about that land: behold, "Thou hast confirmed in Thy virtue the sea," and the land remained thirsting for Thy rain. "Thou hast confirmed in Thy virtue the sea, Thou hast broken in pieces the heads of dragons in the water." Dragons' heads, that is, demons' pride, wherewith the Gentiles were possessed, Thou hast broken in pieces upon the water: for those persons whom they were possessing, Thou by Baptism hast delivered.