But what caused the fall of the angels? How did an angel become the Devil? And how did angels become demons? Jude 6 And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. That word “estate” is the same word, beginning in 2 John 6. But what was their beginning assignment? Was it not to watch over God’s human creation who would be heirs of salvation? Hebrews 1:14 Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?