Angels, Satan, Man

Cui dixit Dominus, Unde venis?  Quid est, quod venientibus angelis electis nequaquam dicitur, Unde venitis? Satan vero unde veniat percontatur? non enim requirimus, nisi utique quae nescimus. Nescire autem Dei, reprobare est. Unde quibusdam in fine dicturus est: Nescio vos unde sitis, discedite a me, omnes operarii iniquitatis. Sicut et nescire mentiri vir verax dicitur qui labi per mendacium dedignatur; non quo si mentiri velit, nesciat, sed quo falsa loqui veritatis amore contemnat. Quid est ergo ad Satan dicere, Unde venis, nisi vias illius quasi incognitas reprobare? Veritatis igitur lumen tenebras, quas reprobat, ignorat; et Satanae itinera, quia judicans damnat, dignum est ut quasi nesciens requirat. Hinc est quod Adae peccanti conditoris voce dicitur, Adam ubi es? Neque enim divina potentia nesciebat, post culpam servus ad quae latibula fugerat; sed quia vidit in culpa lapsu, jam sub peccato velut ab oculis veritatis absconditum, quia tenebras erroris ejus non approbat, quasi ubi sit peccator ignorat; eumque et vocat, et requirit, dicens, Adam ubi es? Per hoc quod vocat, signum dat quia ad poenitentam revocat. Per hoc quod requirit aperte insinuat, quia peccatores jure damnandos ignorat. Satan ergo Dominus non vocat, sed tamen requirit, dicens: Unde venis? quia nimirum Deus apostatam spiritum ad poenitentiam nequaquam revocat; sed vias superbiae ejus nesciens, damnat. Igitur dum Satan de itinere suo discutitur, electi angeli requirendi unde veniant non sunt: quia eroum viae tanto Deo notae sunt, quanto et ipso auctore peraguntur; dumque soli ejus voluntati inserviunt, eo esse incognitiae nequeunt, quo per apporbationis oculum, ex ipso semper ante ipsum fiunt. Sanctus Gregorius Magnus, Moralia, sive Expositio in Job, Liber II

To whom the Lord said, 'From where do you come?'  Why is it that it is not said to the elect Angels, on their coming, 'From where do you come?'  while Satan is questioned from where he comes?  Indeed we never ask about something unless we do not know it. But God's not knowing is condemnation.  So at the end He will say to some, 'I do not know from where you are, depart from me, all you workers of iniquity.'  In like manner it is said that a truthful man does not know how to lie, he who will not stoop to deceit, not that he would not know how if he had the will to lie, but from love of truth he disdains to tell a lie.  What then is it to say to Satan, 'From where do you come?'  unless to reprove his ways as though unknown.  The light of truth then knows nothing of the darkness which it reproves, and as for the paths of Satan, which it as judge  condemns, it befits that it should ask of them as though it were ignorant of them.  Thus it is said to Adam in his sin, by his Creator's voice, 'Adam, where are you?' For Divine Power was not ignorant to what hiding place His servant had fled after his offence, but because He saw him fallen into sin, he was now, as it were, hidden under sin from the eyes of Truth, in that He does not approve the darkness of his error, knowing not, as it were, where the sinner might be, and He both calls him, and asks him, saying, 'Adam, where are you?'  By His calling, He gives him a sign that He recalls him to repentance. By His questioning, He plainly intimates that He does not know, because sinners justly deserve to be damned. So the Lord does not call Satan, but yet He questions him, saying, 'From where do you come?' because certainly God never recalls the apostate spirit to repentance, but, not knowing his paths of pride, He condemns him. Therefore while Satan is examined concerning his way, the elect Angels do not need to be questioned from where they have come, since their ways are known to God in so much as they are moved by that same author, and while they are subservient to His will alone, they can never be unknown to Him, for through the eye of His approbation, it is Himself from Whom and before Whom they act. Saint Gregory the Great, Commentary on Job, Book 2