Fear when it is an inner conviction of the soul destroys and devours impurity, for it is said: Nail down my flesh with the fear of Thee (Psalm 118:120).

And holy love consumes some, according to him who said: Thou hast ravished our heart, Thou hast ravished our heart (Song of Songs 4:9).

But sometimes it makes others bright and joyful, for it is said: My heart trusted in Him and I have been helped; even my flesh has revived (Psalm 27:7); and: When the heart is happy the face is cheerful (Proverbs 15:13).

So when the whole man is in a manner commingled with the love of God, then even his outward appearance in the body, as in a kind of mirror, shows the splendour of his soul.

That is how Moses who had looked upon God was glorified (cf. Exodus 34; 2 Corinthians 3:14).

Those who have reached such an angelic state often forget about bodily food. I think that often they do not even feel any desire for it. And no wonder, for frequently a contrary desire knocks out the thought of food.

I think that the body of those incorruptible men is not even subject to sickness any longer, because it has been rendered incorruptible; for they have purified the inflammable flesh in the flame of purity.

I think that even the food that is set before them they accept without any pleasure. For there is an underground stream that nourishes the root of a plant, and their souls too are sustained by a celestial fire.

The growth of fear is the beginning of love, but a complete state of purity is the foundation of theology.

He who has perfectly united his feeling to God is mystically led by Him to an understanding of His words. But without this union it is difficult to speak about God.

The engrafted Word (cf. James 1:21) perfects purity, and slays death by His presence; and after the slaying of death, the disciple of divine knowledge is illumined.

The Word of the Lord which is from God the Father is pure, and remains so eternally. But he who has not come to know God merely speculates.

Purity makes its disciple a theologian, who of himself grasps the dogmas of the Trinity.

John Climacus (c.575-c.650): The Ladder of Divine Ascent, step 30, 16-24, translated by Archimandrite Lazarus Moore (Harper & Brothers, 1959) @ Prudence True.

When the children of Israel had been freed from slavery in Egypt by the offering of the paschal lamb, they journeyed through the desert toward the Promised Land, and they reached Mount Sinai.

On the fiftieth day after the Passover, the Lord descended upon the mountain in fire, and with the sound of a trumpet and with thunder and lightning, He gave them the ten commandments of the Law.

[...] We already know that the Passover Lamb and the deliverance from Egypt foreshadow the death of Christ and our deliverance from sin, as it is written: “Christ our Passover Lamb is sacrificed for us” (1 Cor 5:7).

He is “the true Lamb Who has taken away the sins of the world” (John 1:29), Who has redeemed us from the slavery of sin at the price of His blood, and by the example of His resurrection has shown us the hope of life and everlasting liberty.

The Law was given on the fiftieth day after the slaying of the lamb, when the Lord descended upon the mountain in fire; likewise on the fiftieth day after the resurrection of our Redeemer, which is today, the grace of the Holy Spirit, descending in the outward appearance of fire, was given to the disciples as they were assembled in the upper room.

The height of the mountain, and the elevation of the upper room, both indicate the sublimity of the commands and of the gifts.

At the sealing of the first covenant, the people remained at the base of the mountain, a handful of elders went partway up, and only Moses ascended to the summit.

At the sealing of the second covenant, the whole community of God’s people was gathered at the summit, in the upper room.

[...] In the law, the fiftieth year was ordered to be called the Year of Jubilee. During that year, all debts were to be cancelled, all slaves to be set free, the very beasts of burden to be eased from their yokes, and the year given over to celebrating the Divine praises.

Therefore, by this number is rightly indicated the tranquillity of that greatest peace when, at the sound of the trumpet, the dead shall be raised imperishable, and we shall all be changed into glory.

Then, when we are freed from every yoke of sin…the entire company of the people of God will give themselves over to contemplating the Heavenly Vision, and the command of the Lord will be fulfilled: “Be still, and know that I am God.”

The Venerable Bede (672/4-735): Homily on the Feast of Pentecost @ Society of Archbishop Justus.

[...]  He is able to search into all our thoughts, and penetrate into every motive of the heart.

Therefore, He pervades us…as light pervades a building, or as a sweet perfume the folds of some honourable robe; so that, in Scripture language, we are said to be in Him, and He in us.

It is plain that such an inhabitation brings the Christian into a state altogether new and marvellous, far above the possession of mere gifts, exalts him inconceivably in the scale of beings, and gives him a place and an office which he had not before.

In St. Peter’s forcible language, he becomes “partaker of the Divine Nature,” and has “power” or authority, as St. John says, “to become the son of God.”

Or, to use the words of St. Paul, “he is a new creation; old things are passed away, behold all things are become new.”

[...]  This wonderful change from darkness to light, through the entrance of the Spirit into the soul, is called Regeneration, or the New Birth; a blessing which, before Christ’s coming, not even Prophets and righteous men possessed, but which is now conveyed to all men freely through the Sacrament of Baptism.

By…the coming of the Holy Ghost, all guilt and pollution are burned away as by fire, the devil is driven forth, sin…is forgiven, and the whole man is consecrated to God.

And this is the reason why He is called “the earnest” of that Saviour who died for us, and will one day give us the fulness of His own presence in heaven.

Hence, too, He is our “seal unto the day of redemption;” for as the potter moulds the clay, so He impresses the Divine image on us members of the household of God.

And His work may truly be called Regeneration; for though the original nature of the soul is not destroyed, yet its past transgressions are pardoned once and for ever, and its source of evil staunched and gradually dried up by the pervading health and purity which has set up its abode in it.

Instead of its own bitter waters, a spring of health and salvation is brought within it; not the mere streams of that fountain, “clear as crystal,” which is before the Throne of God , but, as our Lord says, “a well of water in him,” in a man’s heart, “springing up into everlasting life.”

Hence He elsewhere describes the heart as giving forth, not receiving, the streams of grace: “Out of his belly shall flow rivers of Living Water.” St. John adds, “this spake He of the Spirit” (John 4:14; 7:38, 39).

John Henry Cardinal Newman (1801-1890): Parochial and Plain Sermons, vol. 2, Sermon 19, The Indwelling Spirit.

He who has the Spirit of God in himself – only he has the witness that he is the child of God.

Without the Spirit of God there is no such witness. Not even the entire universe can give this witness.

The universe, alone, without the Spirit of God – what else does it witness to us other than that we are its slaves, its victims, which it unmercifully swallows?

In essence, the pagans thought that also. The opponents of God today, do they not think likewise? They do think so.

For indeed, it is difficult to take that thought away from man who did not recognize the Spirit of Christ, the Spirit of God, the Witness of Heaven.

The same apostle says: “For you have not received the spirit of bondage” (Romans 8:15). What is this spirit of bondage? It is every other spirit except the Spirit of God, Who Christ the Lord sends to those who love Him.

The spirit of bondage is the spirit of materialism, the spirit of fortune-telling, the spirit of naturalism, the spirit of pessimism, the spirit of despair, the spirit of vice.

Only the Spirit of God is the All Holy Spirit of adoption and freedom.

O what happiness, O what peace, O what joy when the Spirit of God cuddles in the cleansed heart of man as a sparrow does in its nest!

Then our hope opens hundreds of doors in the prison of the universe and our embrace, wider than the universe, stretches out to the One Who is greater and more merciful than the universe.

To Whom? To the Father! And then we cry out: “Abba, Father!” (Romans 8:15).

The witness of God, which comes through the eyes, can even lead us to doubt that we are the children of God.

But, the witness which comes to us from the heart, from the Spirit of God, does not leave even the slightest doubt.

God witnesses about God. What kind of doubt can there be? God the Holy Spirit caresses us in the heart of our very being.

Can there be any kind of doubt there? No; for then we know and feel completely confident that God is the Father and we, the children of God. No one’s servants, no one’s slaves, rather the children of God.

O Lord God, Holy Spirit come abide in us and remain with us as a Witness of the Trinity and the Kingdom, as a Witness of the immortal Paradise.

Nikolai Velimirovich (1880-1956; Orthodox Church): Prologue from Ohrid, May 21st.

I have yet many things to say to you, but you cannot bear them now. It is to your advantage that I go away; if I go, I will send you the Advocate.

And also: I will ask the Father and he will give you another Counsellor to be with you for ever, the Spirit of truth. He will guide you into all the truth; for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come. He will glorify me, for he will take what is mine.

From among many of our Lord’s sayings, these have been chosen to guide our understanding, for they reveal to us the intention of the giver, the nature of the gift and the condition for its reception.

Since our weak minds cannot comprehend the Father or the Son, we have been given the Holy Spirit as our intermediary and advocate, to shed light on that hard doctrine of our faith, the incarnation of God.

We receive the Spirit of truth so that we can know the things of God. In order to grasp this, consider how useless the faculties of the human body would become if they were denied their exercise.

Our eyes cannot fulfil their task without light, either natural or artificial; our ears cannot react without sound vibrations, and in the absence of any odor our nostrils are ignorant of their function.

Not that these senses would lose their own nature if they were not used; rather, they demand objects of experience in order to function. It is the same with the human soul. Unless it absorbs the gift of the Spirit through faith, the mind has the ability to know God but lacks the light necessary for that knowledge.

This unique gift which is in Christ is offered in its fullness to everyone. It is everywhere available, but it is given to each man in proportion to his readiness to receive it. Its presence is the fuller, the greater a man’s desire to be worthy of it.

This gift will remain with us until the end of the world, and will be our comfort in the time of waiting. By the favors it bestows, it is the pledge of our hope for the future, the light of our minds, and the splendor that irradiates our understanding.

Hilary of Poitiers (c.300-368): De Trinitate 2, 1, 33.35, from the Office of Readings for Friday of the 7th week of Easter @ Crossroads Initiative.

But God the Almighty Father anointed Him [Christ] the Prince of priests, Who was, not like others anointed in a type under the Law, but was both according to the Law anointed in the body, and in truth was full with the virtue of the Holy Spirit from the Father above the Law.

This is the oil of gladness, of which the prophet says: “God, even Thy God, hath anointed Thee with the oil of gladness above Thy fellows.”

Lastly, Peter says that Jesus was anointed with the Spirit, as you read: “Ye know that word which went through all Judea beginning from Galilee after the baptism which John preached, even Jesus of Nazareth, how God anointed Him with the Holy Spirit.” The Holy Spirit is, then, the oil of gladness.

And well did he say oil of gladness, lest you should think Him a creature; for it is the nature of this sort of oil that it will by no means mingle with moisture of another kind. Gladness, too, does not anoint the body, but brightens the inmost heart, as the prophet said: “Thou hast put gladness in my heart.”

[...] And well is that called oil of gladness wherewith Christ was anointed; for neither was usual nor common oil to be sought for Him, wherewith either wounds are dressed or heat assuaged; since the salvation of the world did not seek alleviation for His wounds, nor the eternal might of His wearied Body demand refreshment.

Nor is it wonderful if He have the oil of gladness, Who made those about to die rejoice, put off sadness from the world, destroyed the odour of sorrowful death. And so the Apostle says: “For we are the good odour of Christ to God;” certainly showing that he is speaking of spiritual things.

But when the Son of God Himself says: “The Spirit of the Lord is upon Me, because He hath anointed Me,” He points out the ointment of the Spirit. Therefore the Spirit is the ointment of Christ.

Or since the Name of Jesus is as ointment poured out, if they wish to understand Christ Himself, and not the Spirit of Christ to be expressed under the name of ointment, certainly when the Apostle Peter says that the Lord Jesus was anointed with the Holy Spirit, it is without doubt plain that the Spirit also is called ointment.

Ambrose of Milan (c. 337-397): On the Holy Spirit, 1, 10, 100-104.

For the Majesty of the Holy Ghost is never separate from the Omnipotence of the Father and the Son, and whatever the Divine government accomplishes in the ordering of all things, proceeds from the Providence of the whole Trinity.

Therein exists unity of mercy and loving-kindness, unity of judgment and justice:  nor is there any division in action where there is no divergence of will.  What, therefore, the Father enlightens, the Son enlightens, and the Holy Ghost enlightens, and…both the Unity and the Trinity are at the same time revealed to us….

The fact, therefore, that, with the co-operation of the inseparable Godhead still perfect, certain things are performed by the Father, certain by the Son, and certain by the Holy Spirit, in particular belongs to the ordering of our Redemption and the method of our salvation.

For if man, made after the image and likeness of God, had retained the dignity of his own nature, and had not been deceived by the devil’s wiles into transgressing through lust the law laid down for him, the Creator of the world would not have become a Creature, the Eternal would not have entered the sphere of time, nor God the Son, Who is equal with God the Father, have assumed the form of a slave and the likeness of sinful flesh.

But because “by the devil’s malice death entered into the world,” and captive humanity could not otherwise be set free without His undertaking our cause, Who without loss of His majesty should both become true Man, and alone have no taint of sin, the mercy of the Trinity divided for Itself the work of our restoration in such a way that the Father should be reconciled, the Son should reconcile, and the Holy Ghost enkindle.

For it was necessary that those who are to be saved should also do something on their part, and by the turning of their hearts to the Redeemer should quit the dominion of the enemy, even as the Apostle says, “God sent the Spirit of His Son into our hearts, crying Abba, Father,” “And where the Spirit of the Lord is, there is liberty,” and “no one can call Jesus Lord except in the Holy Spirit.”

Leo the Great (c.400-461): Sermon 77, 1-2.

And as the Lord said himself: ‘The water that I shall give him shall become in him a well of water springing up into eternal life. . . . But this spake he concerning the Spirit which they that believed in him were to receive.’

[...] The Spirit is called unction and he is seal. For John writes : ‘As for you, the unction which ye received of him abideth in you, and you need not that anyone teach you, but his unction’ — his Spirit ‘teacheth you concerning all things.’

[...] Paul says: ‘In whom having also believed, ye were sealed unto the day of redemption.’ But the creatures are by him sealed and anointed and instructed in all things.

[...] The seal could not be from among the things that are sealed, nor the unction from among the things that are anointed; it pertains to the Word who anoints and seals.

For the unction has the fragrance and odour of  him who anoints; and those who are anointed say, when they receive thereof: ‘We are the fragrance of Christ.’

The seal has the form of Christ who seals, and those who are sealed partake of it, being conformed to it; as the Apostle says: ‘My little children, for whom I am again in travail until Christ be formed in you.’

Being thus sealed, we are duly made, as Peter put it, ‘sharers in the divine nature’; and thus all creation partakes of the Word in the Spirit. Further it is through the Spirit that we are all said to be partakers of God.

For it says: ‘Know ye not that ye are a temple of God and that the Spirit of God dwelleth in you? If any man destroyeth the temple of God, him shall God destroy; for the temple of God is holy, which temple ye are.’

[...]  The fact of our being called partakers of Christ and partakers of God shows that the unction and seal that is in us belongs…to the nature of the Son who, through the Spirit who is in him, joins us to the Father.

This John taught us, as is said above, when he wrote: ‘Hereby know we that we abide in God and he in us, because he hath given us of his Spirit.’

[...] It is on this account that those in whom he is are made divine.

Athanasius of Alexandria (c.293-373): Letters to Serapion, 1.23-24.

Thus, He Himself is with us unto the end of the world, as was promised through the Spirit (Matt. 28:20). For He is One with the Father and the Spirit, not according to hypostasis, but in His divinity, and God is One in Three, in one tri-hypostatic and almighty divinity.

The Holy Spirit always existed and was with the Son in the Father. How could the Father and divine Mind be without beginning if the Son and Word were not also without beginning? How could there be a pre-eternal Word without there also being a pre-eternal Spirit?

Thus the Holy Spirit ever was and is and will be, co-Creator with the Father and the Son, together with them renewing that which has suffered corruption, and sustaining the things that endure.

He is everywhere present and fills, directs and oversees everything. “Whither shall I go from thy spirit”, says the Psalmist to God, “Or whither shall I flee from thy presence?” (Ps. 139:7). He is ‘not just everywhere, but also above all, not just in every age and time, but before them all.

And, according to the promise, the Holy Spirit will not just be with us until the end of the age, but rather will stay with those who are worthy in the age to come, making them immortal and filling their bodies as well with eternal glory, as the Lord indicated by telling His disciples, “I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever” (John 14:16).

“It is sown”, says the Apostle (meaning buried and committed to the earth), “a dead natural body”, that is to, say, an ordinary created body with a created soul, stable and capable of movement.

“It is raised” (that is, comes back to life), “a spiritual body” (cf. 1Cor. 15:44), which means a supernatural body, framed and ordered by the Holy Spirit, and clothed in immortality, glory and incorruption by the Spirit’s power (cf. 1Cor. 15:53).

“The first man, Adam”, he says, “was made a living soul; the last Adam was made a quickening spirit. The first man is of the earth, earthy; the second man is the Lord from heaven. As is the earthy, such are they also that are earthy: and as is the heavenly, such are they also that are heavenly” (cf. 1Cor. 15:45,47-48).

Gregory Palamas (1296-1359): On Pentecost, 12-13 @Mystagogy.

When our Lord entered upon His Ministry, He acted as though He were a mere man, needing grace, and received the consecration of the Holy Spirit for our sakes. He became the Christ, or Anointed, that the Spirit might be seen to come from God, and to pass from Him to us.

And, therefore, the heavenly Gift is not simply called the Holy Ghost, or the Spirit of God, but the Spirit of Christ, that we might clearly understand, that He comes to us from and instead of Christ.

Thus St. Paul says, “God hath sent forth the Spirit of His Son into your hearts;” and our Lord breathed on His Apostles, saying, “Receive ye the Holy Ghost;” and He says elsewhere to them, “If I depart, I will send Him unto you.”

[...] The Comforter who has come instead of Christ, must have vouchsafed to come in the same sense in which Christ came; I mean, that He has come, not merely in the way of gifts, or of influences, or of operations, as He came to the Prophets…; but He comes to us as Christ came, by a real and personal visitation.

[...] We are able to see that the Saviour, when once He entered into this world, never so departed as to suffer things to be as before He came; for He still is with us, not in mere gifts, but by the substitution of His Spirit for Himself, and that, both in the Church and in the souls of individual Christians.

For instance, St. Paul says in the text, “Ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you.” Again, “He shall quicken even your mortal bodies by His Spirit that dwelleth in you.”

“Know ye not that your body is the Temple of the Holy Ghost which is in you?” “Ye are the Temple of the Living God, as God hath said, I will dwell in them, and walk in them.”

The same Apostle clearly distinguishes between the indwelling of the Spirit, and His actual operations within us, when he says, “The love of God is shed abroad in our hearts by the Holy Ghost which is given unto us;” and again, “The Spirit Himself beareth witness with our spirit that we are the children of God.

John Henry Cardinal Newman (1801-1890): Parochial and Plain Sermons, vol. 2, Sermon 19, The Indwelling Spirit.