Ecclesiastes 1:7 - Joseph Benson’s Commentary on the Old and New Testaments

The sea is not full So as to overflow the earth, which might be expected from such vast accessions of waters to it. Whereby also he intimates the emptiness of men's minds, notwithstanding the abundance of creature comforts. Unto the place from whence the rivers come Unto their springs or fountains; thither they return By secret passages of the earth: or their waters, after flowing into the sea, and being mixed with its waters, are exhaled by the heat of the sun, become vapours and clouds, descend in showers on the hills and mountains, and feed the springs from which they flow again, in streams and rivers, into the lakes, seas, and oceans. He seems to speak of the visible and constant motion of the waters, both to the sea and from it, and then to it again in a perpetual reciprocation.