The concept of "forever" is examined carefully because it holds the key to understanding the ultimate fate of Satan and the demons compared to the destiny God has planned for mankind. Rather than assuming that "forever" automatically means unending existence, Scripture reveals that this term often signifies "as long as conditions exist" rather than absolute eternity. This distinction is illustrated by the Old Covenant sacrifices, which were instituted "forever" yet ceased once Christ died, demonstrating that biblical "forever" is conditioned upon God's ongoing purpose rather than being inherently infinite in every instance. This principle becomes essential when addressing whether demons will exist eternally despite their unrepented sin. Some assume that because angels are composed of spirit, they must be indestructible, living forever regardless of their rebellion. This assumption is shown to be false; created spirit is not identical to God's own nature, and God's sovereign control over life extends to angels just as it does to humans, whose lifespans He has shortened or lengthened according to His purposes. Angels have lived for thousands of years not because their spirit nature guarantees endless life, but because God has sustained them for His purposes. The resolution of this question centers on the prophesied purity of the New Heaven and New Earth. Isaiah 65:17 promises new heavens and a new earth where former things "shall not be remembered or come to mind," and God declares in Isaiah 43:25 that He will not remember sins at all. This points to a coming era where sin, and even its memory, will be entirely absent. Since Revelation 21:2-8 and II Peter 3:13 describe a dwelling place where "only righteousness dwells," with no more death, sorrow, or the presence of murderers, liars, or the abominable, there can be no room for unrepentant demons to exist eternally alongside this purity. Revelation 20:10 states that the devil "will be tormented day and night forever and ever" in the lake of fire, yet this must be reconciled with the promise that no unrighteousness will remain in the New Heaven and New Earth. The resolution is that "forever" here describes the completeness and finality of the judgment—destruction by fire—rather than perpetual conscious torment coexisting with a sinless creation. Since Hebrew *abad* and its usage elsewhere in Scripture convey utter destruction and cessation of existence, and since Ezekiel 28 prophesies that Satan will be turned to ashes and be "no more forever," the term "forever" in relation to the demons' punishment signifies the permanence and irreversibility of their annihilation, not an unending continuation of their sinful existence into eternity. This handling of "forever" ties directly into the broader message that God's plan culminates in a Kingdom of everlasting righteousness with no possibility of sin's return, ensuring that "forever" ultimately describes the eternal purity of God's new creation rather than eternal life for unrepentant, sinning spirits.