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By my understanding, angels were created to be holy beings, but also once had free will. This left them open to the sin of pride because of their exalted position, to which Lucifer succumbed (as recounted in Isaiah 14:12-14), causing him to attempt to overthrow God, with other angels joining him in that effort. After they were cast out of heaven for their rebellion, the remaining angels (who had maintained loyalty and obedience to God of their own free will) became "elect" angels who were "sealed" in that condition, so that there would be no more such uprisings.
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