Heb 12:27

“That is, the change of corruptible creation, which by its very nature is capable of wavering; since it was created, that is, received a beginning of existence, it undoubtedly also has an end. For everything created received a beginning, and therefore, by its very nature, also has an end. And the angels are not infinite by nature; but they received immortality by divine grace. "That which is unshakeable may remain." That is, the future blessings. For when everything corruptible is changed, then all that is appointed for the righteous will be incorruptible and unshakable, subject to no "shaking" or change.”

“721. – Then when he says, This phrase, 'Yet once more,' indicates the removal of what is shaken, he explains the words of the prophecy; and he lays great stress on the phrase, Yet once more. For in saying, yet, he shows that they are moveable; but in saying, once more, he indicates that they are to be changed from the state of movability and corruptibility to a state of incorruption and immutability. For if they were to remain in a state of changeableness after that change, he would not have said, once more, but 'again and again.' This is against Origen who believed that the world will be renewed an infinitude of time and be recovered. He says, therefore: and in that he says, 'Yet once more,' he indicates the removal of what is shaken, to a state of immovableness. And as though someone were asking whether God can do this, he adds, as of what has been made. For all things made are subject to God's power; hence, just as God made them from nothing, so He can change them as He wills. And this in order that what cannot be shaken may remain, i.e., that are immovable, i.e., that they remain immovable as to their essences, but changed as to certain accidental dispositions: 'As a vesture you will change them, and they shall be changed' (Ps. 101:28). This has been explained in chap. 1. From all this it is clear that although the things of the Old Testament were moved, it was not to a state of incorruption and immutability; but this is done only in the New, to signify that the promises of the Old Testament were changeable, but not those of the New.”

“this word, Yet once more--So Paul, by the Spirit, sanctions the Septuagint rendering of Hag 2:6, giving an additional feature to the prophecy in the Hebrew, as rendered in English Version, not merely that it shall be in a little while, but that it is to be "once more" as the final act. The stress of his argument is on the "ONCE." Once for all; once and for ever. "In saying 'once more,' the Spirit implies that something has already passed, and something else shall be which is to remain, and is no more to be changed to something else; for the once is exclusive, that is, not many times" [ESTIUS]. those things that are shaken--the heaven and the earth. As the shaking is to be total, so shall the removal be, making way for the better things that are unremovable. Compare the Jewish economy (the type of the whole present order of things) giving way to the new and abiding covenant: the forerunner of the everlasting state of bliss. as of things . . . made--namely, of this present visible creation: compare Co2 5:1; Heb 9:11, "made with hands . . . of this creation," that is, things so made at creation that they would not remain of themselves, but be removed. The new abiding heaven and earth are also made by God, but they are of a higher nature than the material creation, being made to partake of the divine nature of Him who is not made: so in this relation, as one with the uncreated God, they are regarded as not of the same class as the things made. The things made in the former sense do not remain; the things of the new heaven and earth, like the uncreated God, "shall REMAIN before God" (Isa 66:22). The Spirit, the seed of the new and heavenly being, not only of the believer's soul, but also of the future body, is an uncreated and immortal principle.”

“"as of things that are made," that is, those suffering according to nature. For since it takes a beginning and reaches an end, he says, as of things that are made. For since it has been made, and it began from motion, that which comes from non-being to being will reasonably be shaken and moved again in the change. "so that the things which cannot be shaken may remain." The creation shakes and alternates, so that the unshakable may remain; that is, those that will no longer be shaken or changed; as if it were saying: Therefore, it shakes and alternates the creation, so that in the future the unshakable may remain in its place, no longer subject to shaking or changing. The unchanging, therefore, rightly will no longer be subject to shaking. For once it has received the first change, it will be incorruptible.”