All the rivers run into the sea; yet the sea is not full; unto the place from where the rivers come, there they return again.
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Ephrem The Syrian
AD 373
The waters that the earth drank on the first day were not salty. Even if these waters were like the deep on the surface of the earth, they were not yet seas. For it was in the seas that these waters, which were not salty before being gathered together, became salty. When they were sent throughout the entire earth for the earth to drink they were sweet, but when they were gathered into seas on the third day, they became salty, lest they become stagnant due to their being gathered together, and so that they might receive the rivers that enter into them without increasing. For the quantity that a sea requires for nourishment is the measure of the rivers that flow down into it. Rivers flow down into seas lest the heat of the sun dry them up. The saltiness [of the seas] then swallows up [the rivers] lest they increase, rise up and cover the earth. Thus the rivers turn into nothing, as it were, because the saltiness of the sea swallows them up. .
You, whose period of struggle is short, do not become more lifeless than the earth, do not become more unthinking than the insensible, for you are endowed with thought and directed by reason toward life. Instead, as the apostle says, “Continue in the things you have learned and been convinced of,” in that steadfast and immoveable stability, since this also is one of the divine commands, that you “be steadfast and immoveable.” Let your sobriety abide unshaken, your faith firm, your love constant, your stability in every good thing unmoved, so that the earth in you may stand to eternity. But if any one, yearning for greater possessions and letting his desire become as boundless as a sea, has an insatiable greed for the streams of gain flowing in from every side, let him treat his disease by looking at the real sea. For … the sea does not exceed its boundary with the innumerable streams of water flowing into it but remains at the same volume, just as though it were receiving no new water ...
The sea is a receptacle for the confluence of waters from every direction, and neither does the confluence cease, nor does the sea increase. What is the point of the activity as far as the waters are concerned, always filling what is not filled? To what end does the sea receive the inflow of the waters, remaining unincreased by what is added? He says these things so that from the very elements among which a person’s life is spent he might explain in advance the unreality of the things sought among us. For if this urgent cycle of the sun has no end, and the successive changes of light and darkness never cease, and the earth, condemned to immobility, remains unmoved in its fixed place, and the rivers toil without effect, being swallowed up by the insatiable nature of the sea, and in vain the sea receives the inflow of the waters, taking to its bosom without increase what forever pours into it—if these things are in this condition, what is likely to be the state of the humanity which spen...
As for the sea, if I had felt no wonder at its size, I should have felt it for its stillness, at the way it stands free within its proper limits. If its stillness had not moved my admiration, its size must have done. Since both aspects move me, I shall praise the power involved in both. What binding force brought the sea together? What causes it to swell yet stay in position, as if in awe of the land its neighbor? How can it take in all rivers and stay the same through sheer excess of quantity?—I know no other explanation. Why does so great an element have sand as its frontier? Can natural philosophers, with their futile cleverness, give any account of it, when they actually take the sea’s vast measurements with pint size pots of their own ideas? Or shall I give you the short answer from Scripture, the one more credible, more real, than their long arguments? “He made his command a boundary for the face of the waters.” This command is what binds the elemental water. What makes it carry ...