7 Among arts, some have in view production, some practice, others theory. The object of the last is the exercise of thought, that of the second, the motion of the body. Should it cease, all stops; nothing more is to be seen. Thus dancing and music have nothing behind; they have no object but themselves. In creative arts on the contrary the work lasts after the operation. Such is architecture— such are the arts which work in wood and brass and weaving, all those indeed which, even when the artisan has disappeared, serve to show an industrious intelligence and to cause the architect, the worker in brass or the weaver, to be admired on account of his work. Thus, then, to show that the world is a work of art displayed for the beholding of all people; to make them know Him who created it, Moses does not use another word. “In the beginning,” he says “God created.” He does not say “God worked,” “God formed,” but “God created.” Among those who have imagined that the world co-existed with God from all eternity, many have denied that it was created by God, but say that it exists spontaneously, as the shadow of this power. God, they say, is the cause of it, but an involuntary cause, as the body is the cause of the shadow and the flame is the cause of the brightness. It is to correct this error that the prophet states, with so much precision, “In the beginning God created.” He did not make the thing itself the cause of its existence. Being good, He made it an useful work. Being wise, He made it everything that was most beautiful. Being powerful He made it very great. Moses almost shows us the finger of the supreme artisan taking possession of the substance of the universe, forming the different parts in one perfect accord, and making a harmonious symphony result from the whole.
“In the beginning God made heaven and earth.” By naming the two extremes, he suggests the substance of the whole world, according to heaven the privilege of seniority, and putting earth in the second rank. All intermediate beings were created at the same time as the extremities. Thus, although there is no mention of the elements, fire, water and air, imagine that they were all compounded together, and you will find water, air and fire, in the earth. For fire leaps out from stones; iron which is dug from the earth produces under friction fire in plentiful measure. A marvellous fact! Fire shut up in bodies lurks there hidden without harming them, but no sooner is it released than it consumes that which has hitherto preserved it. The earth contains water, as diggers of wells teach us. It contains air too, as is shown by the vapours that it exhales under the sun's warmth when it is damp. Now, as according to their nature, heaven occupies the higher and earth the lower position in space, (one sees, in fact, that all which is light ascends towards heaven, and heavy substances fall to the ground); as therefore height and depth are the points the most opposed to each other it is enough to mention the most distant parts to signify the inclusion of all which fills up intervening Space. Do not ask, then, for an enumeration of all the elements; guess, from what Holy Scripture indicates, all that is passed over in silence.
8. “In the beginning God created the heaven and the earth.” If we were to wish to discover the essence of each of the beings which are offered for our contemplation, or come under our senses, we should be drawn away into long digressions, and the solution of the problem would require more words than I possess, to examine fully the matter. To spend time on such points would not prove to be to the edification of the Church. Upon the essence of the heavens we are contented with what Isaiah says, for, in simple language, he gives us sufficient idea of their nature, “The heaven was made like smoke,” that is to say, He created a subtle substance, without solidity or density, from which to form the heavens. As to the form of them we also content ourselves with the language of the same prophet, when praising God “that stretches out the heavens as a curtain and spreads them out as a tent to dwell in.” In the same way, as concerns the earth, let us resolve not to torment ourselves by trying to find out its essence, not to tire our reason by seeking for the substance which it conceals. Do not let us seek for any nature devoid of qualities by the conditions of its existence, but let us know that all the phenomena with which we see it clothed regard the conditions of its existence and complete its essence. Try to take away by reason each of the qualities it possesses, and you will arrive at nothing. Take away black, cold, weight, density, the qualities which concern taste, in one word all these which we see in it, and the substance vanishes.
If I ask you to leave these vain questions, I will not expect you to try and find out the earth's point of support. The mind would reel on beholding its reasonings losing themselves without end. Do you say that the earth reposes on a bed of air? How, then, can this soft substance, without consistency, resist the enormous weight which presses upon it? How is it that it does not slip away in all directions, to avoid the sinking weight, and to spread itself over the mass which overwhelms it? Do you suppose that water is the foundation of the earth? You will then always have to ask yourself how it is that so heavy and opaque a body does not pass through the water; how a mass of such a weight is held up by a nature weaker than itself. Then you must seek a base for the waters, and you will be in much difficulty to say upon what the water itself rests.
Source: Nine Homilies of Hexaemeron (New Advent)