If, then, every height of man's ability falls below the grandeur of the Spirit (for that is what the Word means in the metaphor of “footstool”), what vanity is theirs who think that there is within themselves a power so great that it rests with them to define the amount of value to be attributed to a being who is invaluable! And so they pronounce the Holy Spirit unworthy of some things which are associated with the idea of value, as if their own abilities could do far more than the Spirit, as estimated by them, is capable of. What pitiable, what wretched madness! They understand not what they are themselves when they talk like this, and what the Holy Spirit against Whom they insolently range themselves. Who will tell these people that men are “a spirit that goes forth and returns not again,” built up in their mother's womb by means of a soiled conception, and returning all of them to a soiled earth; inheriting a life that is likened unto grass; blooming for a little during life's illusion, and then withering away, and all the bloom upon them being shed and vanishing; they themselves not knowing with certainty what they were before their birth, nor into what they will be changed, their soul being ignorant of her peculiar destiny as long as she tarries in the flesh? Such is man.
On the contrary the Holy Spirit is, to begin with, because of qualities that are essentially holy, that which the Father, essentially Holy, is; and such as the Only-begotten is, such is the Holy Spirit; then, again, He is so by virtue of life-giving, of imperishability, of unvariableness, of everlastingness, of justice, of wisdom, of rectitude, of sovereignty, of goodness, of power, of capacity to give all good things, and above them all life itself, and by being everywhere, being present in each, filling the earth, residing in the heavens, shed abroad upon supernatural Powers, filling all things according to the deserts of each, Himself remaining full, being with all who are worthy, and yet not parted from the Holy Trinity. He ever “searches the deep things of God,” ever “receives” from the Son, ever is being “sent,” and yet not separated, and being “glorified,” and yet He has always had glory. It is plain, indeed, that one who gives glory to another must be found himself in the possession of superabundant glory; for how could one devoid of glory glorify another? Unless a thing be itself light, how can it display the gracious gift of light? So the power to glorify could never be displayed by one who was not himself glory, and honour, and majesty, and greatness. Now the Spirit does glorify the Father and the Son. Neither does He lie Who says, “Them that glorify Me I glorify”; and “I have glorified You,” is said by our Lord to the Father; and again He says, “Glorify Me with the glory which I had with You before the world was.” The Divine Voice answers, “I have both glorified, and will glorify again.” You see the revolving circle of the glory moving from Like to Like. The Son is glorified by the Spirit; the Father is glorified by the Son; again the Son has His glory from the Father; and the Only-begotten thus becomes the glory of the Spirit. For with what shall the Father be glorified, but with the true glory of the Son: and with what again shall the Son be glorified, but with the majesty of the Spirit? In like manner, again, Faith completes the circle, and glorifies the Son by means of the Spirit, and the Father by means of the Son.
If such, then, is the greatness of the Spirit, and whatever is morally beautiful, whatever is good, coming from God as it does through the Son, is completed by the instrumentality of the Spirit that “works all in all,” why do they set themselves against their own life? Why do they alienate themselves from the hope belonging to “such as are to be saved”? Why do they sever themselves from their cleaving unto God? For how can any man cleave unto the Lord unless the Spirit operates within us that union of ourselves with Him? Why do they haggle with us about the amount of service and of worship? Why do they use that word “worship” in an ironical sense, derogatory to a Divine and entirely Independent Being, supposing that they desire their own salvation? We would say to them, Your supplication is the advantage of you who ask, and not the honouring of Him Who grants it. Why, then, do you approach your Benefactor as if you had something to give? Or rather, why do you refuse to name as a benefactor at all Him Who gives you your blessings, and slight the Life-giver while clinging to Life? Why, seeking for His sanctification, do you misconceive of the Dispenser of the Grace of sanctification; and as to the giving of those blessings, why, not denying that He has the power, do you deem Him not worthy to be asked to give, and fail to take this into consideration, viz. how much greater a thing it is to give some blessing than to be asked to give it? The asking does not unmistakably witness to greatness in him who is asked; for it is possible that one who does not have the thing to give might be asked for it, for the asking depends only on the will of the asker. But one who actually bestows some blessing has thereby given undoubted evidence of a power residing in him. Why then, while testifying to the greater thing in Him—I mean the power to bestow everything that is morally beautiful — do you deprive Him of the asking, as of something of importance; although his asking, as we have said, is often performed in the case of those who have nothing in their power, owing to the delusion of their devotees? For instance, the slaves of superstition ask the idols for the objects of their wishes; but the asking does not, in this instance of the idols, confer any glory; only people pay that attention to them owing to the deluded expectation that they will get some one of the things they ask for, and so they do not cease to ask. But you, persuaded as you are of what and how great things the Holy Spirit is the Giver, do you neglect the asking them from Him, taking refuge in the law which bids you 'worship God and serve Him only?' Well, how will you worship Him only, tell me, when you have severed Him from His intimate union with His own Only-begotten and His own Spirit? This worship is simply Jewish.
But you will say, “When I think of the Father it is the Son (alone) that I have included as well in that term.” But tell me; when you have grasped the notion of the Son have you not admitted therein that of the Holy Spirit too? For how can you confess the Son except by the Holy Spirit? At what moment, then, is the Spirit in a state of separation from the Son, so that when the Father is being worshipped, the worship of the Spirit is not included along with that of the Son? And as regards their worship itself, what in the world do they reckon it to be? They bestow it, as some exquisite piece of honour, upon the God over all, and convey it over, sometimes, so as to reach the Only-begotten also; but the Holy Spirit they regard as unworthy of such a privilege. Now, in the common parlance of mankind, that self-prostration of inferiors upon the ground which they practise when they salute their betters is termed worship. Thus, it was by such a posture that the patriarch Jacob, in his self-humiliation, seems to have wished to show his inferiority when coming to meet his brother and to appease his wrath; for “he bowed himself to the ground,” says the Scripture, “three times”; and Joseph's brethren, as long as they knew him not, and he pretended before them that he knew them not, by reason of the exaltation of his rank reverenced his sovereignty with this worship; and even the great Abraham himself “bowed himself” “to the children of Heth,” a stranger among the natives of that land, showing, I opine, by that action, how far more powerful those natives were than sojourners. It is possible to speak of many such actions both in the ancient records, and from examples before our eyes in the world now.
Source: On the Holy Spirit (Against the Followers of Macedonius) (New Advent)