But with regard to service and worship, and the other things which they so nicely calculate about, and bring into prominence, we say this; that the Holy Spirit is exalted above all that we can do for Him with our merely human purpose; our worship is far beneath the honour due; and anything else that in human customs is held as honourable is somewhere below the dignity of the Spirit; for that which in its essence is measureless surpasses those who offer their all with so slight and circumscribed and paltry a power of giving. This, then, we say to those of them who subscribe to the reverential conception of the Holy Spirit that He is Divine, and of the Divine nature. But if there is any of them who rejects this statement, and this idea involved in the very name of Divinity, and says that which, to the destruction of the Spirit's greatness, is in circulation among the many, namely, that He belongs, not to making, but to made, beings, that it is right to regard Him not as of a Divine, but as of a created nature, we answer to a proposition such as this, that we do not understand how we can count those who make it among the number of Christians at all. For just as it would not be possible to style the unformed embryo a human being, but only a potential one, assuming that it is completed so as to come forth to human birth, while as long as it is in this unformed state, it is something other than a human being; so our reason cannot recognize as a Christian one who has failed to receive, with regard to the entire mystery, the genuine form of our religion. We can hear Jews believing in God, and our God too: even our Lord reminds them in the Gospel that they recognize no other God than the Father of the Only-begotten, “of Whom ye say that he is your God.” Are we, then, to call the Jews Christians because they too agree to worship the God Whom we adore? I am aware, too, that the Manichees go about vaunting the name of Christ. Because they hold revered the Name to which we bow the knee, shall we therefore number them among Christians? So, too, he who both believes in the Father and receives the Son, but sets aside the Majesty of the Spirit, has “denied the faith, and is worse than an infidel,” and belies the name of Christ which he bears. The Apostle bids the man of God to be “perfect.” Now, to take only the general man, perfection must consist in completeness in every aspect of human nature, in having reason, capability of thought and knowledge, a share of animal life, an upright bearing, risibility, broadness of nail; and if any one were to term some individual a man, and yet were unable to produce evidence in his case of the foregoing signs of human nature, his terming him so would be a valueless honour. Thus, too, the Christian is marked by his Belief in Father, Son, and Holy Ghost; in this consists the form of him who is fashioned in accordance with the mystery of the truth. But if his form is arranged otherwise, I will not recognize the existence of anything whence the form is absent; there is a blurring out of the mark, and a loss of the essential form, and an alteration of the characteristic signs of our complete humanity, when the Holy Spirit is not included in the Belief. For indeed the word of Ecclesiastes says true; your heretic is no living man, but “bones,” he says, “in the womb of her that is with child”; for how can one who does not think of the unction along with the Anointed be said to believe in the Anointed? “Him,” says (Peter), “did God anoint with the Holy Spirit.”
These destroyers of the Spirit's glory, who relegate Him to a subject world, must tell us of what thing that unction is the symbol. It not a symbol of the Kingship? And what? Do they not believe in the Only-begotten as in His very nature a King? Men who have not once for all enveloped their hearts with the Jewish “veil” will not gainsay that He is this. If, then, the Son is in His very nature a king, and the unction is the symbol of His kingship, what, in the way of a consequence, does your reason demonstrate? Why, that the Unction is not a thing alien to that Kingship, and so that the Spirit is not to be ranked in the Trinity as anything strange and foreign either. For the Son is King, and His living, realized, and personified Kingship is found in the Holy Spirit, Who anoints the Only-begotten, and so makes Him the Anointed, and the King of all things that exist. If, then, the Father is King, and the Only-begotten is King, and the Holy Ghost is the Kingship, one and the same definition of Kingship must prevail throughout this Trinity, and the thought of “unction” conveys the hidden meaning that there is no interval of separation between the Son and the Holy Spirit. For as between the body's surface and the liquid of the oil nothing intervening can be detected, either in reason or in perception, so inseparable is the union of the Spirit with the Son; and the result is that whosoever is to touch the Son by faith must needs first encounter the oil in the very act of touching; there is not a part of Him devoid of the Holy Spirit. Therefore belief in the Lordship of the Son arises in those who entertain it, by means of the Holy Ghost; on all sides the Holy Ghost is met by those who by faith approach the Son. If, then, the Son is essentially a King, and the Holy Spirit is that dignity of Kingship which anoints the Son, what deprivation of this Kingship, in its essence and comparing it with itself, can be imagined?
Again, let us look at it in this way. Kingship is most assuredly shown in the rule over subjects. Now what is “subject” to this Kingly Being? The Word includes the ages certainly, and all that is in them; “Your Kingdom,” it says, “is a Kingdom of ages,” and, by ages, it means every substance in them created in infinite space, whether visible or invisible; for in them all things were created by the Maker of those ages. If, then, the Kingship must always be thought of along with the King, and the world of subjects is acknowledged to be something other than the world of rulers, what absurdity it is for these men to contradict themselves thus, attributing as they do the unction as an expression for the worth of Him Whose very nature it is to be a King, yet degrading that unction Itself to the rank of a subject, as if wanting in such worth! If It is a subject by virtue of its nature, then why is It made the unction of Kingship, and so associated with the Kingly dignity of the Only-begotten? If, on the other hand, the capacity to rule is shown by Its being included in the majesty of Kingship, where is the necessity of having everything dragged down to a plebeian and servile lower condition, and numbered with the subject creation? When we affirm of the Spirit the two conditions, we cannot be in both cases speaking the truth: i.e. that He is ruling, and that He is subject. If He rules, He is not under any lord, but if He is subject, then He cannot be comprehended with the Being who is a King. Men are recognized as among men, angels among angels, everything among its kind; and so the Holy Spirit must needs be believed to belong to one only of two worlds; to the ruling, or to the inferior world; for between these two our reason can recognize nothing; no new invention of any natural attribute on the borderland of the Created and the Uncreated can be thought of, such as would participate in both, yet be neither entirely; we cannot imagine such an amalgamation and welding together of opposites by anything being blended of the Created and the Uncreated, and two opposites thus coalescing into one person, in which case the result of that strange mixture would not only be a composite thing, but composed of elements that were unlike, and disagreeing as to time; for that which receives its personality from a creation is assuredly posterior to that which subsists without a creation.
Source: On the Holy Spirit (Against the Followers of Macedonius) (New Advent)