Philo Judaeus De Opificio Mundi 131

Then, preserving the natural order of things, and having a regard to the connection between what comes afterwards and what has gone before, he says next, And a fountain went up from the earth and watered the whole face of the earth. For other philosophers affirm that all water is one of the four elements of which the world was composed. But Moses, who was accustomed to contemplate and comprehend matters with a more acute and far-sighted vision, considers thus: the vast sea is an element, being a fourth part of the entire universe, which the men after him denominated the ocean, while they look upon the smaller seas which we sail over in the light of harbours. And he drew a distinction between the sweet and drinkable water and that of the sea, attributing the former to the earth, and considering it a portion of the earth, rather than of the ocean, on account of the reason which I have already mentioned, that is to say, that the earth may be held together by the sweet qualities of the water as by a chain; the water acting in the manner of glue. For if the earth were left entirely dry, so that no moisture arose and penetrated through its holes rising to the surface in various directions, it would split. But now it is held together, and remains lasting, partly by the force of the wind which unites it, and partly because the moisture does not allow it to become dry, and so to be broken up into larger and smaller fragments.