Theophylact of Bulgaria
What, then, do they not know? They do not know that, according to the Genesis of Moses, the heavens were from water. For according to him (Gen 1:6), God Himself commanded the firmament to be in the midst of the water.
Likewise the earth, by His command, appeared from the waters in which it had previously been submerged. Since heaven and earth consist of waters, the flood came unexpectedly.
As destruction through water occurred at the time of the flood, so now all things are destined to be destroyed through fire. Together with this the ungodly also will perish.
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There are two principal elements of the universe, water and fire. From them two further elements receive their being: air from evaporating waters, and earth from condensing waters. This evaporation and condensation are produced by fire.
Anyone who has understanding will believe this, for the nature of fire received such power from God the Creator Himself.
Therefore, if there are only two elements, and the first destruction of the ungodly was through water, then it is altogether necessary, he says, that the second destruction of the ungodly occur through fire.
It was from water as the material cause, and by water as the operative cause. For water holds the earth together, binding its dust and giving it firmness. If this did not happen, the earth would turn into dust and air.
Some idle talker may perhaps object to us: why did God, who created the visible world, not create it firm from the beginning? Why must He bring it to perfection through the flood in Noah's time, and through fire at the end of the world, as Peter now says?
To such a man we will say, first, that the world cannot be unchangeable. How will that which received being through change possess changelessness? It was brought into being from non-being, and no prudent man will call this anything but change.
Since the change toward the worse reached the very worst, the Creator of the world necessarily purified it in Noah's time by water, in order to raise it toward the better. At the end He will do so by fire.
We ourselves are accustomed to subject certain things to the action of fire, not in order to destroy them, but to give them purity and brightness. No one, probably, will doubt this.
God promises to do something similar at the end of the age through fire. He will destroy what is superfluous and useless for the future state of men, such as plants, cattle, and forest. Thus beings unnecessary for incorruptible life will be destroyed.
If this is so, then those who claim that this visible world was incorruptible from the beginning speak idly. If anyone should reason in the same way about intelligible beings, since they too were brought into being from non-being, let him understand this.
Their very simplicity, or non-composite nature, guarantees their indestructibility and their nearness, by their very being, to the blessed and divine nature.