Moses now proceeds to speak of new creatures also produced out of the waters; namely, of birds and fishes. He connects these two creatures in his narrative on account of their similarity of nature. For as the fish swims in the water, so does the bird swim as it were in the air. Though their flesh differs, yet they have the same origin. For the sacred text is here quite plain, that the birds when created out of the waters immediately flew into the air where they now live. Moses here retains moreover his uniform term in calling the whole region above us, "heaven." And first it is worthy of admiration that, although the fishes and the birds were both created out of the same matter, the waters, yet as the bird cannot live in the water, neither can the fish exist, if brought into the air. Physicians rightly argue, when they affirm that the flesh of birds is more wholesome than that of fishes, even though the nature of birds is also aqueous; because they live in a more rarified element; for air is a purer element than water; the latter, in which the fish are generated and live, being constituted of the dregs as it were of the former. Philosophers however do not believe this identity of the nature of birds and of fishes. But the faith of the sacred Scriptures which is far above philosophy and far more certain, assures us that the nature of the fish and of the bird had the same origin. Here again is a further proof of the divine authority and majesty of this book, in that it sets before us under such various forms that power of God by which he created all things, beyond the conception of all reason and understanding. Who for instance could ever have thought, that out of water a nature could be produced, which should by no means endure water? But the Word of God speaks, and in a moment out of water are created birds. If therefore the Word of God but sound, all things are immediately possible; and out of the same water shall be formed either fishes or birds. Every bird therefore and every fish is nothing more or less than a word of divine grammar or language; by which grammar all things, otherwise impossible, immediately become possible and easy; by which also things contrary and conflicting become similar and harmonious; and vice versa.