Ps 103:25

“Let us, therefore, in the faith of the disciples, converse frequently with our Master. For the world is like the sea to us, my brothers, of which it is written, "This is the great and wide sea, there go the ships; the Leviathan, which you have created to play therein." We float on this sea, as with the wind, through our own free will, for everyone directs his course according to his will, and either, under the pilotage of the Word, he enters into rest, or, laid hold on by pleasure, he suffers shipwreck and is in peril by storm. For as in the ocean there are storms and waves, so in the world there are many afflictions and trials.”

“"This great and wide sea, in it there are creeping things without number." Who can describe the beauty of the fishes therein? Who can describe the greatness of the whales and the nature of the amphibious animals, how they live on the dry land and in the waters? Who can describe the depth and breadth of the sea or the shock of its tumultuous waves? The sea stays within its confines because of him who said, "This far shall you come but no farther, and here shall your proud waves be stilled!" It clearly reveals the decree imposed on it, when running out it leaves on the sands a distinct line marked by its waves, as though to signify to those who see it that it has not transgressed its appointed bounds.”

“..."So is the great and wide sea also; wherein are things creeping innumerable, both small and great beasts." He speaketh of the sea as terrible. Snares creep in this world, and surprise the careless suddenly; for who numbereth the temptations that creep? They creep, but beware, lest they snatch us away. Let us keep watch on the Wood; even in the water, even on the waves, we are safe: let not Christ sleep, let not faith sleep; if He hath slept, let Him be awakened; He will command the winds; He will calm the sea; the voyage will be ended, and we shall rejoice in our country. For I see in this terrible sea unbelievers still; for they dwell in barren and bitter waters: but they are both small and great. We know this: many little men of this world are still unbelievers, many great men of this world are so: there are living creatures, both small and great, in this sea. They hate the Church: the name of Christ is a burden to them: they rage not, because they are not permitted; the cruelty which cannot burst forth in deeds, is shut up within the heart. For all, whether small or great, "creeping things, both small and great," who at present grieve at the temples being shut, the altars overthrown, the images broken, the laws which make it a capital crime to sacrifice to idols; all who mourn on this account, are still in the sea. What then of us? And by what road then are we to journey unto our country? Through this very sea, but on the Wood. Fear not the danger; that wood which holdeth together the world doth bear thee up.”

“After this the prophet added the words "The sea also, great and wide, in which are schools without number of living things." The sea is understood as the world, which is full of storms and dangerous waves, even full of bitterness and saltiness. It also has quite large fish that do not cease to devour the smaller ones. There are numberless creeping things, so-called because they creep over the earth. For this reason carnal people and those who are too fond of the world, because they think only of the present life and continuously apply themselves to its pursuits out of love for it, are not unfittingly called creeping things.”