The answer about the beginning of the devils fall.
Serenus: The passage in Genesis shows that that was not the beginning of his fall and p. 379 ruin, as before their deception it takes the view that he had already been branded with the ignominy of the name of the serpent, where it says: “But the serpent was wiser” or as the Hebrew copies express it, “more subtle than all the beasts of the earth, which the Lord God had made.” 1535 You see then that he had fallen away from his angelic holiness even before he deceived the first man, so that he not only deserved to be stamped with the ignominy of this title, but actually excelled all other beasts of the earth in the subterfuges of wickedness. For Holy Scripture would not have designated a good angel by such a term, nor would it say of those who were still continuing in that state of bliss: “But the serpent was wiser than all the beasts of the earth.” For this title could not possibly be applied I say not to Gabriel or Michæl, but it would not even be suitable to any good man. And so the title of serpent and the comparison to beasts most clearly suggests not the dignity of an angel but the infamy of an apostate. Finally the occasion of the envy and seduction, which led him to deceive man, arose from the ground of his previous fall, in that he saw that man, who had but recently been formed out of the dust of the ground, was to be called to that glory, from which he remembered that he himself, while still one of the princes, had fallen. And so that first fall of his, which was due to pride, and which obtained for him the name of the serpent, was followed by a second owing to envy: and as this one found him still in the possession of something upright so that he could enjoy some interchange of conference and counsel with man, by the Lords sentence he was very properly cast down to the lowest depth, that he might no longer walk as before erect, and looking up on high, but should cleave to the ground and creep along, and be brought low upon his belly and feed upon the earthly food and works of sins, and henceforward proclaim his secret hostility, and put between himself and man an enmity that is to our advantage, and a discord that is to our profit, so that while men are on their guard against him as a dangerous enemy, he can no longer injure them by a deceptive show of friendship.
Gen. iii. 1.