(This is a repeat, because someone wants to read it and the print in the earlier post is too small. However, if you haven't read it it is worth reading; and if you have, it is worth reading again)
This article is an excerpt from (The Wellspring of Worship Ignatius Press, 2005).
If we consent in prayer to be flooded by the river of life, our entire being will be transformed; we will become trees of life and be increasingly able to produce the fruit of the Spirit: we will love with the very Love that is our God. It is necessary at every moment to insist on this radical consent, this decision of the heart by which our will submits unconditionally to the energy of the Holy Spirit; otherwise we shall remain subject to the illusion created by mere knowledge of God and talk about him and shall in fact remain apart from him in brokenness and death. On the other hand, if we do constantly renew this offering of our sinful hearts, let us not imagine that our New Covenant with Jesus will be a personal encounter pure and simple. The communion into which the Spirit leads us is not limited to a face-to-face encounter between the person of Christ and our own person or to an external conformity of our wills with his. The lived liturgy does indeed begin with this "moral" union, but it goes much further. The Holy Spirit is an anointing, and he seeks to transform all that we are into Christ: body, soul, spirit, heart, flesh, relations with others and the world. If love is to become our life, it is not enough for it to touch the core of our person; it must also impregnate our entire nature.
To this transformative power of the river of life that permeates the entire being (person and nature), the undivided tradition of the Churches gives an astonishing name that sums up the mystery of the lived liturgy: theosis or divinization. Through baptism and the seal of the gift of the Holy Spirit we have become "sharers of the divine nature" (2 Pet 1:4). In the liturgy of the heart, the wellspring of this divinization streams out as the Holy Spirit, and our individual persons converge in a single origin. But how is this mysterious synergy to infuse our entire nature from its smallest recesses to its most obvious behaviors? This process is the drama of divinization in which the mystery of the lived liturgy is brought to completion in each Christian.
The Mystery of Jesus
To enter into the name of the holy Lord Jesus does not mean simply contemplating it from time to time or occasionally identifying with his passionate love for the Father and his compassion for men. It also means sharing faithfully and increasingly in his humanity, in assuming which he assumed ours as well. In our baptism we "put on Christ" in order that this putting on might become the very substance of our life. The beloved Son has united us to himself in his body, and the more he makes our humanity like his own, the more he causes us to share in his divinity. The humanity of Jesus is new because it is holy. Even in its mortal state it shared in the divine energies of the Word, without confusion and in an unfathomable synergy in which his will and human behavior played their part. Jesus is not a divinized man; he is the truly incarnated Word of God.
This last statement means that we need not imitate, from afar and in an external way, the behavior of Jesus as recorded in the Gospel, in order thereby to effect our own divinization and become "like God"; self-divinization is the primal temptation ever lurking in wait. On the contrary, it is the Word who divinizes this human nature, which he has united to himself once and for all. Since his Resurrection his divinehuman energies are those of his Holy Spirit, who elicits and calls for our response; in the measure of this synergy of the Spirit and our heart our humanity shares in the life of the holy humanity of Christ. To enter into the name of Jesus, Son of God and Lord, means therefore to be drawn into him in the very depths of our being, by the same drawing movement in which he assumed our humanity by taking flesh and living out our human condition even to the point of dying. There is no "panchristic" pseudo-mysticism here, because the human person remains itself, a creature who is free over against its Lord and God. Neither, however, is there any moralism (a further error that waits to ensnare us), because our human nature really shares in the divinity of its Savior.
"Man becomes God as much as God becomes a man", says Saint Maximus the Confessor.  Christian holiness is divinization because in our concrete humanity we share in the divinity of the Word who married our flesh. The "divine nature" of which Saint Peter speaks (2 Pet 1:4) is not an, abstraction or a model, but the very life of the Father, which he eternally communicates to his Son and his Holy Spirit. The Father is its source, and the Son extends it to us by becoming a man. We become God by being more and more united to the humanity of Jesus. The only question left, then since this humanity is the way by which our humanity will put on his divinity–is this: How did the Son of God live as a man in our mortal condition? The Gospel has been written precisely in order to show us "the mind of Christ Jesus" (Phil 2:5);  it is this mind with which the Holy Spirit seeks to fill our hearts.
According to the spirituality of the Church and according to the gifts of the Spirit given to every one, each of the baptized lives out more intensely one or other aspect of the mind of Christ; at the same time, however, the mystery of divinization is fundamentally the same in all Christians. Their humanity no longer belongs to them, in the possessive and deadly sense of "belong", but to him who died and rose for them. In an utterly true sense, all that makes up my nature–its powers of life and death, its gifts and experiences, its limits and sins–is no longer "mine" but belongs to "him who loved me and gave himself up for me". This transfer of ownership is not idealistic or moral but realistic and mystical. As we shall see, the identification of Jesus with the humanity of every human person plays a very large part in the new relationship that persons establish with other men; but when the identification is willingly accepted and when our rebellious wills submit to his Spirit, divinization is at work. I was wounded by sin and radically incapable of loving; now Love has become part of my nature again: "I am alive; yet it is no longer 1, but Christ living in me" (Gal 2:20).
The Realism of the Liturgy of the Heart
The mystical realism of our divinization is the fruit of the sacramental realism of the liturgy. Conversely, evangelical moralism, with which we so often confuse life according to the Spirit, is the inevitable result of a deterioration of the liturgy into sacred routines. But when the fontal liturgy, which is the realism of the mystery of Christ, gives life to our sacramental celebrations, in the same measure the Spirit transfigures us in Christ.
The Fathers of the early centuries tell us that "the Son of God became a man, in order that men might become sons of God". The stages by which the beloved Son came among us and united himself to us to the point of dying our death are the same stages by which he unites us to him and leads us to the Father, to the point of making us live his life. These stages of the one Way that is Christ are shown to us in figures in the Old Testament; Jesus fulfilled the prefigurations. The stages are creation and promise, Passover and exodus, Covenant and kingdom, exile and return, restoration and expectation of the consummation. The two Testaments inscribed this great Passover of the divinizing Incarnation in the book of history. But in the last times the Bible becomes life; it exists in a liturgical condition, and the action of God is inscribed in our hearts. Knowledge of the mystery is no longer a mental process but an event that the Holy Spirit accomplishes in the celebrated liturgy and then brings to fulfillment by divinizing us.
But it is not enough simply to understand the ways in which Christ divinizes us; the primary thing is to be able to live them. At certain "moments" the celebrated liturgy gives us an intense experience of the economy of salvation, which is divinization, in order that we may live it at all "times", these new times into which it has brought us. According to the Fathers of the desert, either we pray always or we never pray. But in order to pray always we must pray often and sometimes at length. In like manner (for we are dealing with the same mystery), in order to divinize us the Spirit must divinize us often and sometimes very intensely. The economy of salvation that emerges from the Father through his Christ in the Holy Spirit expands to become the divinized life that Christians live in the Holy Spirit, through the name of Jesus, the Christ and Lord, in movement toward the Father. But the celebration of the liturgy is the place and moment in which the river of life, hidden in the economy, penetrates the life of the baptized in order to divinize it. It is there that everything that the Word experiences for the sake of man becomes Spirit and life.
The Holy Spirit, Iconographer of Divinization
In the economy of salvation everything reaches completion in Jesus through the outpouring of the Holy Spirit; in the liturgy as celebrated and as lived everything begins through the Holy Spirit. That is why at the existential origin of our divinization is the liturgy of the heart, the synergy in which the Holy Spirit unites himself to our spirit (Rom 8:16) in order to make us be, and show that we are, sons of God. The same Spirit who "anointed" the Word with our humanity and imprinted our nature upon him is written in our hearts as the living seal of the promise, in order that he may "anoint" us with the divine nature: he makes us christs in Christ. Our divinization is not passively imposed on us, but is our own vital activity, proceeding inseparably from him and from ourselves.
When the Spirit begins his work in us and with us, he is not faced with the raw, passive earth out of that he fashioned the first Adam or, much less, the virginal earth, permeated by faith, that he used in effecting the conception of the second Adam. What the Spirit finds is a remnant of glory, an icon of the Son: ceaselessly loved, but broken and disfigured. Each of us can whisper to him what the funeral liturgy cries out in the name of the dead person: I remain the image of your inexpressible glory, even though I am wounded by sin!"  This trust that cannot be confounded and this Covenant that cannot be broken form the space wherein the patient mystery of our divinization is worked out.
The sciences provide grills for interpreting the human riddle, but when these have been applied three great questions still remain in all that we seek and in all that we do: the search for our origin, the quest for dialogue, the aspiration for communion. On the one hand, why is it that I am what I am, in obedience to a law that is stronger than I am (see Rom 7)? On the other, in the smallest of my actions I await a word, a counterpart who will dialogue with me. Finally, it is clear that our mysterious selves cannot achieve fulfillment on any level, from the most organic to the most aesthetic, except in communion. These three pathways in my being are, as it were, the primary imprints in me of the image of glory, of the call of my very being to the divine likeness in which my divinization will be completed. The Holy Spirit uses arrows of fire in restoring our disfigured image. The fire of love consumes its opposite (sin) and transforms us into itself, which is Light.
We wander astray like orphans as long as we have not accepted him, the Spirit of sonship, as our virginal source. All burdens are laid upon us, and we are slaves as long as we are not surrendered to him who is freedom and grace. And because he is the Breath of Life, it is he who will teach us to listen (we are dumb only because we are deaf); then, the more we learn to hear the Word, the better we shall be able to speak. Our consciences will no longer be closed or asleep, but will be transformed into creative silence. Finally, Utopian love and the communion that cannot be found because it is "not of this world" are present in him, the "treasure of every blessing", not as acquired and possessed but as pure gift; our relationship with others becomes transparent once again. This communion of the Holy Spirit is the master stroke in the work of divinization, because in this communion we are in communion also with the Father and his Son, Jesus (2 Cor 13:13; Jn 1:3), and with all our brothers.
Following these three pathways of the transfigured icon, we are divinized to the extent that the least impulses of our nature find fulfillment in the communion of the Blessed Trinity We then "live" by the Spirit, in oneness with Christ, for the Father. The only obstacle is possessiveness, the focusing of our persons on the demands of our nature, and this is sin for the quest of self breaks the relation with God. The asceticism that is essential to our divinization and that represents once again a synergy of grace consists in simply but resolutely turning every movement toward possessiveness into an offering. The epiclesis on the altar of the heart must be intense at these moments, so that the Holy Spirit may touch and consume our death and the sin that is death's sting. Entering into the name of Jesus, the Son of God and the Lord who shows mercy to us sinners, means handing over to him our wounded nature, which he does not change by assuming but which he divinizes by putting on. From offertory to epiclesis and from epiclesis to communion the Spirit can then ceaselessly divinize us; our life becomes a eucharist until the icon is completely transformed into him who is the splendor of the Father.