Augustine of Hippo
Every rational soul is either wretched because of its sins, or blessed because of its righteous deeds. Every irrational soul either yields to the stronger, obeys the better, equals its equal, creates a rival, or harms what it has already surpassed.
Finally, the body serves its soul insofar as this is permitted by the soul's merits and by the order of things. There is no evil in any nature. Rather, each nature's own guilt becomes evil for it.
Then the soul, reborn by the grace of God, restored to its original incorruption, and subjected to the one Who created it, will have its body restored to its former strength. It will cease to be under the power of the world and will itself begin to possess the world.
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Then there will be no evil for it, because it will be above that lower beauty of temporal things which formerly existed with it. Then there will be, as it is written, a new heaven and a new earth (see also Is 65:17), for souls no longer laboring but reigning.
"All things are yours," says the Apostle, "and you are Christ's, and Christ is God's" (1 Cor 3:23). And "the head of the woman is the man, the head of the man is Christ, and the head of Christ is God" (1 Cor 11:3).
Therefore, since the soul's corruption is not in its nature but contrary to its nature, and is nothing other than sin and the punishment for sin, it is clear from this that no nature, or rather no substance or essence, is evil.
After finishing his discourse on the judgment, in which John foretold the condemnation of the evil, it remains for him to speak also about the good.
"And I saw," John says, "a new heaven and a new earth; for the former heaven and the former earth had passed away, and the sea was no more." This will happen in the order he had already indicated above, when he said that he saw the One seated on the throne, from Whose face heaven and earth fled away (cf. Rev 20:11).
After the condemnation of those not written in the book of life, and after they are cast into eternal fire, the form of this world will pass away through destruction by cosmic fires. What kind of fire this will be, and in what part of the world or universe it will be, I think no man knows, except one to whom the Holy Spirit reveals it.
It will be as the flood was brought about by an inundation of the world's waters. Thus, in this cosmic conflagration, those properties of the corruptible elements that corresponded to our corruptible bodies will be destroyed by fire.
The substance itself will receive such properties as, through a marvelous change, will correspond to immortal bodies. Thus the world, renewed for the better, will be fully adapted to men renewed for the better also in the flesh.
Concerning the words, "and the sea was no more," I find it difficult to say whether it will be dried up or also changed into something better.
For we read that the heaven will be new and the earth new, but I do not recall reading anywhere of a new sea, except in those places in this same book where it speaks of a glassy sea like crystal (Rev 4:6).
In those cases, however, the end of the age is not being discussed. It also seems that the sea is not spoken of in the proper sense there, but as though it were a sea.
Nevertheless, because prophetic speech loves to mix figurative expressions with direct ones, the words "and the sea was no more" may refer to that sea which gave up the dead who were in it (Rev 20:13).
For then this rebellious and stormy age, understood under the name of the sea, will no longer be the life of mortals.