Isaias 6:7

Now about the first there is no necessity of going into minute detail. No one is so carnal, so brutelike, as to imagine that the Spirit resides in the sensible world. But after Paul has mentioned “the things that are not seen” he proceeds (in order that none may surmise that the Spirit, because He is of the intelligible and immaterial world, on account of this connexion subsists therein) to another most distinct division into the things that have been made in the way of creation, and the existence that is above creation. He mentions the several classes of these created intelligibles: “thrones,” “dominions,” “principalities,” “powers,” conveying his doctrine about these unseen influences in broadly comprehensive terms: but by his very silence he separates from his list of things created that which is above them. …

56. Why should I enter into detail? He lived not to himself, but to Christ and his preaching. He crucified the world to himself, and being crucified to the world and the things which are seen, he thought all things little, and too small to be desired; even though from Jerusalem and round about unto Illyricum he had fully preached the Gospel, even though he had been prematurely caught up to the third heaven, and had a vision of Paradise, and had heard unspeakable words. Such was Paul, and everyone of like spirit with him. …

113. But perhaps some one will say that the Seraph said to Isaiah: “Behold, this hath touched thy lips, and shall take away thine iniquities, and purge away thy sins.” Shall take away, he says, and shall purge, not I will take away, but that fire from the altar of God, that is, the grace of the Spirit. For what else can we piously understand to be on the altar of God but the grace of the Spirit? Certainly not the wood of the forests, nor the soot and coals. Or what is so in accordance with piety as to understand according to the mystery that it was revealed by the mouth of Isaiah that all men should be cleansed by the passion of Christ, Who as a coal according to the flesh burnt up our sins, as you read in Zechariah: “Is not this a brand cast forth from the fire? And that was Joshua clothed in filthy garments.”

And therefore with daily sighs all the saints grieve over this weakness of their nature and while they search into their shifting thoughts and the secrets and inmost recesses of their conscience, cry out in entreaty: “Enter not into judgment with Thy servant, for in Thy sight shall no man living be justified;” and this: “Who will boast that he hath a chaste heart? or who will have confidence that he is pure from sin?” and again: “There is not a righteous man upon earth that doeth good and sinneth not;” and this also: “Who knoweth his faults?” And so they have recognized that man’s righteousness is weak and imperfect and always needs God’s mercy, so that one of those whose iniquities and sins God purged away with the live coal of His word sent from the altar, after that marvellous vision of God, after his view of the Seraphim on high and the revelation of heavenly mysteries, said: “Woe is …

46. Glory then be to Him the Invisible, who clothed Himself in invisibility, that sinners might he able to draw near to Him. For our Lord did not repel the sinful woman as the Pharisee expected; inasmuch as He descended from the height which no man can reach unto, altogether in order that lowly publicans, like Zaccheus, might reach unto Him. And the Nature which none can handle, clothed Itself in a body, altogether in order that all lips might kiss His feet as the sinful woman did. For the sacred soul was hidden within the veil of flesh, and so touched all unclean lips and sanctified them. Thus He Whom His appetite was supposed to invite to feasting, His feet invited to tears; He was the good Physician, who came forth to go to the sinful woman who was seeking Him in her soul. …