And the angels who kept not their first estate, but left their own habitation, he has reserved in everlasting chains under darkness unto the judgment of the great day.
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Aquinas Study Bible
AD 2017
The idea conveyed here, is the same with that expressed in 2 Peter 2:4. Although the words of this passage would appear to afford grounds for the opinion that the demons are confined to hell, it is, however, the far more probable opinion, that they were first hurled into hell, and that some of them were by divine dispensation, as St. Thomas Aquinas (Sum Theo 3.89.8) expresses it, allowed to come forth to tempt and carry out war against mankind. (Bishop John McEvilly) under darkness and everlasting chains: perhaps this is a specific place called TARTARUS. (John Litteral)
"But the angels", he says, "that kept not their own pre-eminence," that, namely, which they received through advancement, "but left their own habitation," meaning, that is, the heaven and the stars, became, and are called apostates. "He has reserved these to the judgment of the great day, in chains, under darkness." He means the place near the earth, that is, the dark air. Now he called "chains" the loss of the honour in which they had stood, and the lust of feeble things; since, bound by their own lust, they cannot be converted.
Principality. That is, the state in which they were first created, their original dignity. (Challoner)
Having given themselves over to fornication, or to excessive uncleanness.
Going after other flesh, and seeking unnatural lusts, with those of the same sex. (Witham)
Impurity punished by fire and sulphur. Fire is a punishment proportioned to the criminal passion of the voluptuous. That of Sodom was most dreadful, but then it was of short duration. There is another fire that will never be extinguished.