It is true that the idea of a devil falling from heaven and becoming the enemy of the human race was known to the Jews only in the course of time; but the divine author, who knew that this idea would spread some day, deigned to plant the seed of it in the early chapters of Genesis.
We really know nothing of the fall of the wicked angels except from these few words in the Epistle of St. Jude: "Wandering stars, to whom is reserved the blackness of darkness for ever, of whom Enoch also, the seventh from Adam, prophesied." It has been thought that these wandering stars were the angels transformed into malevolent demons, and we supply the place of the prophecies of Enoch, the seventh man after Adam, which we no longer have. But no matter into what labyrinth learned men may wander, in trying to explain these incomprehensible things, we must always understand in an edifying sense whatever we cannot understand literally.
The ancient Brahmans, as we said, had this theology many centuries before the Jewish nation came into existence. The ancient Persians had given names to the devils long before the Jews did so. You are aware that in the Pentateuch we do not find the name of any angel, good or bad. There is no mention of Gabriel, or Raphael, or Satan, or Asmodeus in the Jewish books until long afterwards, when the little people had learned their names during the Babylonian captivity [or the Persian domination]. That shows, at least, that the doctrine of celestial and infernal beings was common to all great nations. You will find it in the book of Job, a precious monument of antiquity. Job