After this ye hear the chanter inviting you with a sacred melody to the communion of the Holy Mysteries, and saying, O taste and see that the Lord is good . Trust not the judgment to your bodily palate no, but to faith unfaltering; for they who taste are bidden to taste, not bread and wine, but the anti-typical Body and Blood of Christ. — Catechetical Lecture 23.

One ought, moreover, to recognise that it is one thing to look at a matter as it is, and another thing to look at it in the light of reason and thought. In the case of all created things, the distinction of the subsistences is observed in actual fact. For in actual fact Peter is seen to be separate from Paul. But the community and connection and unity are apprehended by reason and thought. For it is by the mind that we perceive that Peter and Paul are of the same nature and have one common nature. For both are living creatures, rational and mortal: and both are flesh, endowed with the spirit of reason and understanding. It is, then, by reason that this community of nature is observed. For here indeed the subsistences do not exist one within the other. But each privately and individually, that is to say, in itself, stands quite separate, having very many points that divide it from the other. For they are both separated in space and differ in time, and are divided in thought, and power, and shape, or form, and habit, and temperament and dignity, and pursuits, and all differentiating properties, but above all, in the fact that they do not dwell in one another but are separated. Hence it comes that we can speak of two, three, or many men.

And this may be perceived throughout the whole of creation, but in the case of the holy and superessential and incomprehensible Trinity, far removed from everything, it is quite the reverse. For there the community and unity are observed in fact, through the co-eternity of the subsistences, and through their having the same essence and energy and will and concord of mind, and then being identical in authority and power and goodness —” I do not say similar but identical —” and then movement by one impulse. For there is one essence, one goodness, one power, one will, one energy, one authority, one and the same, I repeat, not three resembling each other. But the three subsistences have one and the same movement. For each one of them is related as closely to the other as to itself: that is to say that the Father, the Son, and the Holy Spirit are one in all respects, save those of not being begotten, of birth and of procession. But it is by thought that the difference is perceived . For we recognise one God: but only in the attributes of Fatherhood, Sonship, and Procession, both in respect of cause and effect and perfection of subsistence, that is, manner of existence, do we perceive difference . For with reference to the uncircumscribed Deity we cannot speak of separation in space, as we can in our own case. For the subsistences dwell in one another, in no wise confused but cleaving together, according to the word of the Lord, I am in the father, and the father in Me: nor can one admit difference in will or judgment or energy or power or anything else whatsoever which may produce actual and absolute separation in our case. Wherefore we do not speak of three Gods, the Father, the Son, and the Holy Spirit, but rather of one God, the holy Trinity — Book I, Chapter 8, Concerning the Holy Trinity.

Likewise we believe also in one Holy Spirit, the Lord and Giver of Life: Who proceeds from the Father and rests in the Son: the object of equal adoration and glorification with the Father and Son, since He is co-essential and co-eternal: the Spirit of God, direct, authoritative, the fountain of wisdom, and life, and holiness: God existing and addressed along with Father and Son: uncreate, full, creative, all-ruling, all-effecting, all-powerful, of infinite power, Lord of all creation and not under any lord: deifying, not deified: filling, not filled: shared in, not sharing in: sanctifying, not sanctified: the intercessor, receiving the supplications of all: in all things like to the Father and Son: proceeding from the Father and communicated through the Son, and participated in by all creation, through Himself creating, and investing with essence and sanctifying, and maintaining the universe: having subsistence, existing in its own proper and peculiar subsistence, inseparable and indivisible from Father and Son, and possessing all the qualities that the Father and Son possess, save that of not being begotten or born. For the Father is without cause and unborn: for He is derived from nothing, but derives from Himself His being, nor does He derive a single quality from another. Rather He is Himself the beginning and cause of the existence of all things in a definite and natural manner. But the Son is derived from the Father after the manner of generation, and the Holy Spirit likewise is derived from the Father, yet not after the manner of generation, but after that of procession. And we have learned that there is a difference between generation and procession, but the nature of that difference we in no wise understand. Further, the generation of the Son from the Father and the procession of the Holy Spirit are simultaneous.

All then that the Son and the Spirit have is from the Father, even their very being: and unless the Father is, neither the Son nor the Spirit is. And unless the Father possesses a certain attribute, neither the Son nor the Spirit possesses it: and through the Father, that is, because of the Father’s existence, the Son and the Spirit exist, and through the Father, that is, because of the Father having the qualities, the Son and the Spirit have all their qualities, those of being unbegotten, and of birth and of procession being excepted. For in these hypostatic or personal properties alone do the three holy subsistences differ from each other, being indivisibly divided not by essence but by the distinguishing mark of their proper and peculiar subsistence.

Further we say that each of the three has a perfect subsistence, that we may understand not one compound perfect nature made up of three imperfect elements, but one simple essence, surpassing and preceding perfection, existing in three perfect subsistences. — Book I, Chapter 8, Concerning the Holy Trinity.

And this also it behoves us to know, that the names Fatherhood, Sonship and Procession, were not applied to the Holy Godhead by us: on the contrary, they were communicated to us by the Godhead, as the divine apostle says, Wherefore I bow the knee to the Father, from Whom is every family in heaven and on earth. But if we say that the Father is the origin of the Son and greater than the Son, we do not suggest any precedence in time or superiority in nature of the Father over the Son (for through His agency He made the ages ), or superiority in any other respect save causation. And we mean by this, that the Son is begotten of the Father and not the Father of the Son, and that the Father naturally is the cause of the Son: just as we say in the same way not that fire proceeds from light, but rather light from fire. So then, whenever we hear it said that the Father is the origin of the Son and greater than the Son, let us understand it to mean in respect of causation. And just as we do not say that fire is of one essence and light of another, so we cannot say that the Father is of one essence and the Son of another: but both are of one and the same essence. And just as we say that fire has brightness through the light proceeding from it, and do not consider the light of the fire as an instrument ministering to the fire, but rather as its natural force: so we say that the Father creates all that He creates through His Only-begotten Son, not as though the Son were a mere instrument serving the Father’s ends, but as His natural and subsistential force . And just as we say both that the fire shines and again that the light of the fire shines, So all things whatsoever the Father does, these also does the Son likewise. But whereas light possesses no proper subsistence of its own, distinct from that of the fire, the Son is a perfect subsistence, inseparable from the Father’s subsistence, as we have shown above. For it is quite impossible to find in creation an image that will illustrate in itself exactly in all details the nature of the Holy Trinity. For how could that which is create and compound, subject to flux and change, circumscribed, formed and corruptible, clearly show forth the super-essential divine essence, unaffected as it is in any of these ways? Now it is evident that all creation is liable to most of these affections, and all from its very nature is subject to corruption. — Book I, Chapter 8, Concerning the Holy Trinity.

So then in the first sense of the word the three absolutely divine subsistences of the Holy Godhead agree: for they exist as one in essence and uncreate. But with the second signification it is quite otherwise. For the Father alone is ingenerate, no other subsistence having given Him being. And the Son alone is generate, for He was begotten of the Father’s essence without beginning and without time. And only the Holy Spirit proceeds from the Father’s essence, not having been generated but simply proceeding. For this is the doctrine of Holy Scripture. But the nature of the generation and the procession is quite beyond comprehension. — Book I, Chapter 8, Concerning the Holy Trinity.

Accordingly the everlasting God generates His own Word which is perfect, without beginning and without end, that God, Whose nature and existence are above time, may not engender in time. But with man clearly it is otherwise, for generation is with him a matter of sex, and destruction and flux and increase and body clothe him round about , and he possesses a nature which is male or female. For the male requires the assistance of the female. But may He Who surpasses all, and transcends all thought and comprehension, be gracious to us.

The holy catholic and apostolic Church, then, teaches the existence at once of a Father: and of His Only-begotten Son, born of Him without time and flux and passion, in a manner incomprehensible and perceived by the God of the universe alone: just as we recognise the existence at once of fire and the light which proceeds from it: for there is not first fire and thereafter light, but they exist together. And just as light is ever the product of fire, and ever is in it and at no time is separate from it, so in like manner also the Son is begotten of the Father and is never in any way separate from Him, but ever is in Him . But whereas the light which is produced from fire without separation, and abides ever in it, has no proper subsistence of its own distinct from that of fire (for it is a natural quality of fire), the Only-begotten Son of God, begotten of the Father without separation and difference and ever abiding in Him, has a proper subsistence of its own distinct from that of the Father. — Book I, Chapter 8, Concerning the Holy Trinity.

(We believe) in one Father, the beginning , and cause of all: begotten of no one: without cause or generation, alone subsisting: creator of all: but Father of one only by nature, His Only-begotten Son and our Lord and God and Saviour Jesus Christ, and Producer of the most Holy Spirit. And in one Son of God, the Only-begotten, our Lord, Jesus Christ: begotten of the Father, before all the ages: Light of Light, true God of true God: begotten, not made, consubstantial with the Father, through Whom all things are made: and when we say He was before all the ages we show that His birth is without time or beginning: for the Son of God was not brought into being out of nothing , He that is the effulgence of the glory, the impress of the Father’s subsistence , the living wisdom and power, the Word possessing interior subsistence , the essential and perfect and living image of the unseen God. But always He was with the Father and in Him , everlastingly and without beginning begotten of Him. For there never was a time when the Father was and the Son was not, but always the Father and always the Son, Who was begotten of Him, existed together. For He could not have received the name Father apart from the Son: for if He were without the Son , He could not be the Father: and if He thereafter had the Son, thereafter He became the Father, not having been the Father prior to this, and He was changed from that which was not the Father and became the Father. This is the worst form of blasphemy . For we may not speak of God as destitute of natural generative power: and generative power means, the power of producing from one’s self, that is to say, from one’s own proper essence, that which is like in nature to one’s self. — Book I, Chapter 8, Concerning the Holy Trinity.

We believe, then, in One God, one beginning , having no beginning, uncreate, unbegotten, imperishable and immortal, everlasting, infinite, uncircumscribed, boundless, of infinite power, simple, uncompound, incorporeal, without flux, passionless, unchangeable, unalterable, unseen, the fountain of goodness and justice, the light of the mind, inaccessible; a power known by no measure, measurable only by His own will alone (for all things that He wills He can ), creator of all created things, seen or unseen, of all the maintainer and preserver, for all the provider, master and lord and king over all, with an endless and immortal kingdom: having no contrary, filling all, by nothing encompassed, but rather Himself the encompasser and maintainer and original possessor of the universe, occupying all essences intact and extending beyond all things, and being separate from all essence as being super-essential and above all things and absolute God, absolute goodness, and absolute fulness : determining all sovereignties and ranks, being placed above all sovereignty and rank, above essence and life and word and thought: being Himself very light and goodness and life and essence, inasmuch as He does not derive His being from another, that is to say, of those things that exist: but being Himself the fountain of being to all that is, of life to the living, of reason to those that have reason; to all the cause of all good: perceiving all things even before they have become: one essence, one divinity, one power, one will, one energy, one beginning, one authority, one dominion, one sovereignty, made known in three perfect subsistences and adored with one adoration, believed in and ministered to by all rational creation , united without confusion and divided without separation (which indeed transcends thought). (We believe) in Father and Son and Holy Spirit whereinto also we have been baptized . For so our Lord commanded the Apostles to baptize, saying, Baptizing them in the name of the Father, Son, and Holy Spirit. — Book I, Chapter 8, Concerning the Holy Trinity.

Let us now investigate what are our common conceptions concerning the Spirit, as well those which have been gathered by us from Holy Scripture concerning It as those which we have received from the unwritten tradition of the Fathers. First of all we ask, who on hearing the titles of the Spirit is not lifted up in soul, who does not raise his conception to the supreme nature? It is called Spirit of God, Spirit of truth which proceeds from the Father, right Spirit, a leading Spirit. Its proper and peculiar title is Holy Spirit; which is a name specially appropriate to everything that is incorporeal, purely immaterial, and indivisible. So our Lord, when teaching the woman who thought God to be an object of local worship that the incorporeal is incomprehensible, said God is a spirit. On our hearing, then, of a spirit, it is impossible to form the idea of a nature circumscribed, subject to change and variation, or at all like the creature. We are compelled to advance in our conceptions to the highest, and to think of an intelligent essence, in power infinite, in magnitude unlimited, unmeasured by times or ages, generous of Its good gifts, to whom turn all things needing sanctification, after whom reach all things that live in virtue, as being watered by Its inspiration and helped on toward their natural and proper end; perfecting all other things, but Itself in nothing lacking; living not as needing restoration, but as Supplier of life; not growing by additions; but straightway full, self-established, omnipresent, origin of sanctification, light perceptible to the mind, supplying, as it were, through Itself, illumination to every faculty in the search for truth; by nature unapproachable, apprehended by reason of goodness, filling all things with Its power, but communicated only to the worthy; not shared in one measure, but distributing Its energy according to the proportion of faith; in essence simple, in powers various, wholly present in each and being wholly everywhere; impassively divided, shared without loss of ceasing to be entire, after the likeness of the sunbeam, whose kindly light falls on him who enjoys it as though it shone for him alone, yet illumines land and sea and mingles with the air. So, too, is the Spirit to every one who receives it, as though given to him alone, and yet It sends forth grace sufficient and full for all mankind, and is enjoyed by all who share It, according to the capacity, not of Its power, but of their nature.

Now the Spirit is not brought into intimate association with the soul by local approximation. How indeed could there be a corporeal approach to the incorporeal? This association results from the withdrawal of the passions which, coming afterwards gradually on the soul from its friendship to the flesh, have alienated it from its close relationship with God. Only then after a man is purified from the shame whose stain he took through his wickedness, and has come back again to his natural beauty, and as it were cleaning the Royal Image and restoring its ancient form, only thus is it possible for him to draw near to the Paraclete. And He, like the sun, will by the aid of your purified eye show you in Himself the image of the invisible, and in the blessed spectacle of the image you shall behold the unspeakable beauty of the archetype. Through His aid hearts are lifted up, the weak are held by the hand, and they who are advancing are brought to perfection. Shining upon those that are cleansed from every spot, He makes them spiritual by fellowship with Himself. Just as when a sunbeam falls on bright and transparent bodies, they themselves become brilliant too, and shed forth a fresh brightness from themselves, so souls wherein the Spirit dwells, illuminated by the Spirit, themselves become spiritual, and send forth their grace to others. Hence comes foreknowledge of the future, understanding of mysteries, apprehension of what is hidden, distribution of good gifts, the heavenly citizenship, a place in the chorus of angels, joy without end, abiding in God, the being made like to God, and, highest of all, the being made God. Such, then, to instance a few out of many, are the conceptions concerning the Holy Spirit, which we have been taught to hold concerning His greatness, His dignity, and His operations, by the oracles of the Spirit themselves. — Chapter 9

The soul has to depart from the surroundings of this life, and the pollutions of the earthly body, and to press on to those heavenly companies, though it is for the saints alone, to attain to them, and to sing praise to God (as in the prophet’s words we hear of those who are harping and saying: “For great are Thy marvellous works, O Lord God Almighty, just and true are Thy ways, Thou King of the nations; who shall not fear and magnify Thy Name, for Thou only art holy, for all nations shall come and worship before Thee”), and to see Thy marriage feast, O Lord Jesus, in which the Bride is led from earthly to heavenly things, while all rejoice in harmony, for “to Thee shall all flesh come,” now no longer subject to transitory things, but joined to the Spirit, to see the chambers adorned with linen, roses, lilies, and garlands. Of whom else is the marriage so adorned? For it is adorned with the purple stripes of confessors, the blood of martyrs, the lilies of virgins, and the crowns of priests.

Holy David desired beyond all else for himself that he might behold and gaze upon this, for he says: “One thing have I asked of the Lord, that will I seek after; that I may dwell in the house of the Lord all the days of my life, and see the pleasure of the Lord.”

It is a pleasure to believe this, a joy to hope for it; and certainly, not to have believed it is a pain, to have lived in this hope a grace. But if I am mistaken in this, that I prefer to be associated after death with angels rather than with beasts, I am gladly mistaken, and so long as I live will never suffer myself to be cheated of this hope.

For what comfort have I left but that I hope to come quickly to thee, my brother, and that thy departure will not cause a longseverance between us, and that it may be granted me, through thy intercessions, that thou mayest quickly call me who long for thee. For who is there who ought not to wish for himself beyond all else that “this corruptible should put on incorruption, and this mortal put on immortality”? that we who succumb to death through the frailty of the body, being raised above nature, may no longer have to fear death. — Two Books on the Decease of His Brother Saytrus – Book II, para. 132-135.