Genesis 1:6

The mass of waters, which from all directions flowed over the earth, and was suspended in the air, was infinite, so that there was no proportion between it and the other elements. Thus, as it has been already said, the abyss covered the earth. We give the reason for this abundance of water. None of you assuredly will attack our opinion; not even those who have the most cultivated minds, and whose piercing eye can penetrate this perishable and fleeting nature; you will not accuse me of advancing impossible or imaginary theories, nor will you ask me upon what foundation the fluid element rests. By the same reason which makes them attract the earth, heavier than water, from the extremities of the world to suspend it in the centre, they will grant us without doubt that it is due both to its natural attraction downwards and its general equilibrium, that this immense quantity of water rests motionless upon the earth. Therefore the prodigious mass of waters was spread around the earth; not in proportion with it and infinitely larger, thanks to the foresight of the supreme Artificer, Who, from the beginning, foresaw what was to come, and at the first provided all for the future needs of the world. But what need was there for this superabundance of water? The essence of fire is necessary for the world, not only in the economy of earthly produce, but for the completion of the universe; for it would be imperfect if the most powerful and the most vital of its elements were lacking. Now fire and water are hostile to and destructive of each other. Fire, if it is the stronger, destroys water, and water, if in greater abundance, destroys fire.

On the second day God said: Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.

First of all, it is proved from the account of the creation that God divided the one place which extends from the earth to the first heaven, by placing in the middle the firmament, that is, the second heaven, thus making the one place into …

And let it divide between water and water: and it was so. And God made the firmament; and God divided between the water which was under the firmament, and the water above the firmament: and it was so. As the excessive volume of water bore along over the face of the earth, the earth was by reason thereof "invisible" and "formless." When the Lord of all designed to make the invisible visible, He fixed then a third part of the waters in the midst; and another third part He set by itself on high, raising it together with the firmament by His own power; and the remaining third He left beneath, for the use and benefit of men. Now at this point we have an asterisk. The words are found in the Hebrew, but do not occur in the Septuagint.

The second vision is understood of the second day, when a firmament was made in the midst, and this firmament is faith which divides the waters.

Wisdom refers to the understanding of the eternal God, knowledge to the knowing of God made man. Wherefore the firmament was made in the midst of the waters, that is, faith, in order that the soul may know those things that are above the firmament …

The second time corresponds to the second day and to the age of childhood: for then there was made "a firmament in the midst of the waters."

A firmament: Strabus and Bede teach that there is an eternal heaven, because the firmament, which they take to mean the sidereal heaven, is said to have been made, not in the beginning, but on the second day: whereas the reason given by Basil is …

The second age, in which through the ark and the flood the good were saved and the wicked destroyed, corresponds to the second day, on which through the firmament the separation of waters from waters was made.

There is the distinction of transparent nature from transparent, and this was made on the second day in the division of waters from waters.

It is rightly said that the firmament was made in the midst of the waters, not because the waters above the heavens are fluid, cold, heavy, and corruptible waters, but because they are subtle and incorruptible, pervious and raised above all contrariety, and on this …

In the work of virtue, six things are required corresponding to the works of the six days. It is necessary that a man set for himself a right end in God; and this is indicated when he says: Let there be a firmament in the …

How is this image of God upon man defaced! How small are the remains of it, and how great the ruins of it! The Lord renew it upon our souls by his sanctifying grace!

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And God said, let there be a firmament in the midst of the waters,....

And God said, Let there be a firmament - Our translators, by following the firmamentum of the Vulgate, which is a translation of the στερεωμα of the Septuagint, have deprived this passage of all sense and meaning. The Hebrew word רקיע rakia, from רקע raka, to spread out as the curtains of a tent or pavilion, simply signifies an expanse or space, and consequently that circumambient space or expansion separating the clouds, which are in the higher regions of it, from the seas, etc., which are below it.

firmament--an expanse--a beating out as a plate of metal: a name given to the atmosphere from its appearing to an observer to be the vault of heaven, supporting the weight of the watery clouds. By the creation of an atmosphere, the lighter parts of the waters which overspread the earth's surface were drawn up and suspended in the visible heavens, while the larger and heavier mass remained below. The air was thus "in the midst of the waters," that is, separated them; and this being the apparent use of it, is the only one mentioned, although the atmosphere serves other uses, as a medium of life and light.

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- IV. The Second Day 6. רקיע rāqı̂ya‛, “expanse;” στερέωμα stereōma, רקע rāqa‛, “spread out by beating, as leaf gold.” This expanse was not understood to be solid, as the fowl is said to fly on the face of it Gen 1:21. It is also described as luminous Dan 12:3, and as a monument of divine power Psa 150:1. 7. עשׂה ‛āśâh “work on,” “make out of already existing materials.” The second act of creative power bears upon the deep of waters, over which the darkness had prevailed, and by which the solid crust was still overlaid. This mass of turbid and noisy water must be reduced to order, and confined within certain limits, before the land can be reached. According to the laws of material nature, light or heat must be an essential factor in all physical changes, especially in the production of gases and vapors. Hence, its presence and activity are the first thing required in instituting a new process of nature. Air naturally takes the next place, as it is equally essential to the maintenance of vegetable and animal life. Hence, its adjustment is the second step in this latest effort of creation. Gen 1:6 Let there be an expanse in the midst of the water. - For this purpose God now calls into existence the expanse. This is that interval of space between the earth on the one side and the birds on the wing, the clouds and the heavenly bodies on the other, the lower part of which we know to be occupied by the air. This will appear more clearly from a comparison of other passages in this chapter (Gen 1:14, Gen 1:20). And let it be dividing between water and water. - It appears that the water in a liquid state was in contact with another mass of water, in the shape of dense fogs and vapors; not merely overhanging, but actually resting on the waters beneath. The object of the expanse is to divide the waters which are under it from those which are above it. […]