“Who shall be punished with everlasting destruction from the presence of the Lord, and from the glory of his power;”
King James Version (KJV)
1:9 From the glory of his power - Tremble, ye stout - hearted. Everlasting destruction - As there can be no end of their sins, (the same enmity against God continuing,) so neither of their punishment; sin and its punishment running parallel throughout eternity itself. They must of necessity, therefore, be cut off from all good, and all possibility of it. From the presence of the Lord - Wherein chiefly consists the salvation of the righteous. What unspeakable punishment is implied even in falling short of this, supposing that nothing more were implied in his taking vengeance!
2Th 1:9 Who shall be punished. Those who obey not the gospel shall be punished. The punishment is everlasting destruction. This does not mean annihilation, but an eternal banishment from the presence of the Lord. In Matthew, the doom of the wicked is "Depart from me" (Mt 25:41). The saints are "ever with the Lord" (1Th 4:17); the wicked are driven forever from his presence.