
God the Father (top), and the Holy Spirit (represented by a dove) depicted above Jesus, painting by Francesco Albani 1600s
The Mosaic revelation, as compared with the cosmic revelation, represents a great advance in the knowledge of the true God; but it represents, nevertheless, nothing more than a stage. It is only in Jesus Christ that the hidden God is truly revealed: “No man hath seen God at any time: the only begotten Son who is in the bosom of the Father, he hath declared him.” [John 1:18]
The Epistle to the Hebrews describes the sequence of revelations: “God, who, at sundry times and in divers manners, spoke in times past to the fathers by the prophets, last of all, in these days hath spoken to us by his Son.” [Hebrews 1:1-2] This revelation is that of the last days, after which there can be no further manifestations, for God has expressed his fullness in the Word.
The object of this revelation is the Trinity of Persons — that is, strictly speaking, the mystery of God, wholly inaccessible to human reason, hidden in darkness. All forms of knowledge and all comparisons that we bring to bear on this subject are deceiving, even those of the greatest theologians. They are justified in the sight of reason only insofar as they more or less clarify its apophatic nature, hidden as it is, and transcending all reason. For it will always remain true that the requirement of human reason, when it follows its inclination, is that of reducing everything to unity and seeing in all differences a secondary, subsidiary stage.
This is so true that theologians like Eckhardt have tended to see in the Trinity a manifestation of primordial, unfathomable unity. But in reality the paradox is that the Three is as primitive as the One. It participates in the structure of absolute Being. Without doubt the master key to Christian theology, which distinguishes it utterly from all rational theodicy, is contained in the statement that the Trinity of Persons constitutes the structure of Being, and that love is therefore as primary as existence.
At the same time, this inaccessible mystery is the whole of Christianity — not merely a single aspect, but its very essence. For Christianity is the appeal addressed to man by the Father, inviting him to share in the life of the Son through the gift of the Spirit. This constitutes the very essence of Christianity. The first words that a child hears the Church speak over him are: “I baptize you in the Name of the Father, and of the Son, and of the Holy Spirit.” He is thrown, as a creature of flesh and blood, into the abyss of Trinitarian life, to which all life and all eternity will have no other object than to accustom him. It is in the gift that it makes of its own life that the Trinity at the same time communicates and reveals itself, estranging man from his own ways and views in order to transfer him into itself.
Thus it remains true of this supreme revelation of God that, as we said of the preceding revelations, it is through his action in the world and in man that God makes himself known. Here again, Scripture confronts us with facts; and it is on these facts that theology is to reflect. But while the Old Testament showed us God the One making a covenant with Israel and drawing it away from idols, the New Testament confronts us with God the Three revealed in Jesus Christ.
This progressive revelation corresponds to a course of divine instruction, whose development Gregory of Nazianzen has well described: “The Old Testament has clearly, though darkly, revealed the Father and the Son. The New Testament has revealed the Son and provided a glimpse of the divinity of the Holy Spirit. Now the Holy Spirit dwells among us and is revealed more clearly.” [Theological Discourses, v, 2] It was first necessary that faith in the unity of God, in monotheism, should be profoundly rooted in a human race always inclined toward polytheism, in order that, at the heart of that unity, the Trinity of Persons could be revealed without any danger. This revelation of the oneness of God fills the Old Testament to overflowing. The New Testament reveals chiefly the divinity of the Word. According to the excellent view of Gregory, the revelation of the Holy Spirit fills the time of the Church, which is the manifestation of its mighty works.
Gregory of Nazianzen continues by saying, “It was necessary to proceed by successive perfectings, by `degrees’, in David’s phrase; it was necessary to advance from radiance to radiance, through ever more luminous movements of advance, in order that the light of the Trinity might finally be seen to shine forth.” The brightness of the Trinity is such that man’s sight could not have borne it. According to the ancient view of Irenaeus, it was necessary that God should acclimatize man gradually to the vision of his unendurable glory.
The light that blazes from the countenance of the Father is already too overwhelming a sight for men of flesh and blood. It is by gradual stages that the divinity of the Word appears darkly in the Old Testament, and clearly in the Gospel. The Holy Spirit in its turn crowns the education of mankind with the Trinitarian vision. Thus man goes on from glory to glory, and the whole history of salvation may be considered as a gradual unveiling of the ineffable Trinity.
But if the New Testament alone gives us knowledge of the Three Persons, at the same time it throws light upon the wholeness of God’s plan and displays it as being entirely the work of the Trinity. It appears, in fact, to be a history of the divine missions; all the works of God are fulfilled by the Three Persons, but each acts in a particular manner. St. Irenaeus explains this clearly when he writes, “The Father is well pleased and commands, the Son works and creates, the Spirit nourishes and gives increase, and man moves little by little towards perfection.” [Against Heresies., iv, 38, 3] The Father is He who sends; the Word and the Spirit are sent. Thus the divine missions are like a reflection of the eternal relationships between the Persons; their economy appears as theology, and it is through this epiphany of the Trinitarian life that man glimpses something of its eternal existence.
So again we follow the very order of revelation, when we begin our account of the Trinity of Persons with their action in the world. The New Testament is in fact essentially a testimony borne to this action; it shows us Christ, who is God, and who is distinct from the Father; it shows us the Spirit, who is God since he bestows the life of God, and who is sent by the Father and the Son. It is through the divine works carried out by the Three Persons that theology is to discover little by little, in an endless task of contemplation, what they are in themselves. That is why we shall speak of the Trinity as revealed in Scripture — above all as a series of missions. Later we shall develop theologically the mystery of their relationship. Before speaking in particular of the Word and the Spirit, we shall speak of these missions in general.
They begin, we said, with creation. All is the work of the Three Persons. St. John says of the Word, “All things were made by him” [John 1:3] and the Epistle to the Hebrews, in the sequel to the passage we quoted above, declares that God “in these days hath spoken to us by his Son, whom he bath appointed heir of all things.” [Hebrews 1:2] Against the Gnostics, who contrasted the God of creation with the God of redemption, St. Irenaeus insists on the unity of God’s plan. Christ is that same Word of God who created the world and man in the beginning, and who, in the fullness of time, came down to earth to reawaken his creature, to restore him and grant him incorruptibility.
We have already had occasion to encounter the theme of creation, both in relation to cosmic religion and to Mosaic revelation. But each of these revelations shows us new wonders. On the level of cosmic religion, the theme appeared as a sign of the fundamental distinction between God and the creature, and of the creature’s subsistence in his basic dependence on God. On the level of Mosaic revelation, we encountered the theme as the first phase in the history of salvation, of God’s plan which began with time (since it is time itself), but whose content remained veiled. From the beginning, the Three Persons created in their own image a human being, called to share in their life and to be led by them into Paradise.
Thus the light of the New Testament comes to illuminate, retrospectively, the Old. In Origen’s phrase, it “whitens the fields of the Scriptures for the harvest,”[Commentary Job., XIII, 46] by bringing forth what was only a seed. In the beginning, says St. Irenaeus, the gift of the Spirit was still tentative, for the hand of God, which is the Word, had not yet grasped man in that everlasting grip which was to be known one day as the Incarnation.
But meanwhile these beginnings of mankind were bathed in a supernatural light, and the artists of the Middle Ages were right to show us Adam and Eve talking with the Three Persons. Since man appeared, formed by the Three Persons, he has been called to share in their life. Paradise is the place where the divine energy is at work, and where that tree of life is to be found which communicates incorruptibility. In all this there is a foreshadowing of the Church.
This is expressed by the Fathers of the Church in the doctrine of “man created in the image and likeness of God”. Faithful to the literal meaning of the biblical text, Athanasius and Gregory of Nyssa do not see in the image and likeness two different realities, but two aspects of the same reality. [R. Bernard, L'Image de Dieu d'apres SaintAthanase, pp. 22-38; Jean Danielou, Platonisme et theologie mystique, pp. 48-61.] For them, this reality is not reason, which is simply nature, but that sharing in the life of the Trinity which is grace.
Made in the image of the only begotten Son, who is the perfect image of the Father, the first Adam is already called in the Son to be the child of the Father and the temple of the Spirit. Thus the creation of man appears, in the light of the New Testament, already to be plunged in the sphere of Trinitarian grace.
The history of God’s people, Israel, in its turn sheds fresh light on the subject, for it becomes the place of the magnalia of the Trinity [vocab: the magnalia dei, the great deeds God has done for us in creation and redemption.]. For if it is the shape of God’s total plan that it should be through the Word and the Spirit that the Father should accomplish his mysterious designs, this was also true in the time of the Old Covenant. St. Paul already states this when he shows us in the desert rock, from which a stream arises, a foretelling of Christ — that is, an act of the Word in the history of the world. St. Irenaeus is faithful to this spirit when he sees in the history of Israel the action of the Word and the Holy Spirit, by whom man was created, and who acclimatize him gradually to the life of the Trinity in order to prepare him for that inwardness of human and divine nature that is to be fulfilled in due time in the Incarnation. In this way the Fathers of the Church acknowledged the theophanies of the Old Testament as revelations of the Word.
No one has expressed this view more profoundly than St. Irenaeus. “All the visions of the Old Testament”, he writes, “represent the Son of God speaking with men and living in their midst. He did not leave the human race, but remained with them, foretelling what must happen and teaching men the things of God. Thus He foreshadowed in our terms, and showed us through imagery, what was to come.” [The Demonstration of the Apostolic Preaching, V] So, like creation, the covenant shines, in the light of the Old Testament, with the brightness of the Trinity. We said that the covenant foreshadowed the Incarnation, insofar as it was a sign of a God who comes to meet man and establish with him a living kinship. But now, to be more accurate, it is the Word of God who, according to Irenaeus, foreshadows his Incarnation by making himself familiar with the ways of men.
This familiarizing of the Word of God with the ways of men prepares for the Incarnation, insofar as the latter is a movement of God toward man. But Irenaeus notices, too, another aspect: the Word of God at the same time familiarizes man with the things of God, in order to make him fit to enter, through the Incarnation, into full communion with him: “God created man from the beginning, because of His munificence; He chose the patriarchs for their salvation; He educated His restless people, by teaching them to serve God; He sent His prophets into the world, accustoming man to bear His Spirit and live in communion with God.” [Against Heresies, IV, 14, 2]
And later Irenaeus says, “Thus the Word of God, traversing all times, educated His people, calling them through secondary things to primary things, through imagery to reality, through things temporal to things eternal, through the carnal to the spiritual.” [Against Heresies, IV, 14, 3]
But only the light of Christianity enables us to see in the Old Testament this manifestation of the Trinity, whereas it is the very subject matter of the New Testament, whose purpose is to bear witness to the Incarnation of the Word and the outpouring of the Spirit, and which through these two missions teaches us to distinguish them from the Father. All these mysteries of Christ appear as the work of the Three Persons. St. Luke shows us the Holy Spirit descending on Mary to arouse in her the humanity of Christ, and St. John shows us the Word of God becoming “flesh”, that is, taking human nature.
It is the Spirit who leads Zechariah to the Temple and Jesus to the desert. It is he whom the Incarnate Word, present in Mary, shows forth in John the Baptist at the Visitation. Above all, the Three Persons appear in the great theophany of the Baptism, when the voice of the Father bears witness that Christ, who plunges in the waters of Jordan, is his beloved Son, while the Spirit descends upon him in the likeness of a dove. On two further occasions, the voice of the Father is to bear witness to Christ — at two solemn moments, that of the Transfiguration, and that of the Agony, according to St. John.’ [John 12:27-28]
This revelation, which remains veiled in the Synoptics, appears in all its fullness in St. John’s Gospel. The only begotten Son, distinct front the Father, shares completely in his divine nature: “I and the Father are one.” The work of salvation is the joint work of the Father and the Son: “For the Father loveth the Son, and sheweth him all things which himself doth.” [John 5:20]
The Son is sent by the Father. He fulfills the work that the Father has given him. His mission is to make known the Father and communicate his life. But, as he does nothing save with the Father, he who sees him sees the Father, and he who believes in him has eternal life. Thus, through the mission of the Word, the Trinity of Persons is revealed at the same time as their unity; eternal life, which is the life of God, draws near to man through him, to take hold of man and awaken him.
For this work of redemption is not only Threefold insofar as it leads mankind, through the mediation of Jesus, to share in the life of the Three Persons; it is the mystery of filial adoption that is the boundary of the divine work, that design hidden in God which St. Paul describes: “Blessed be the God and Father of our Lord Jesus Christ, who hath … [chosen] us in him before the foundation of the world, that we should be holy and unspotted in his sight in charity … hath predestinated us unto the adoption of children through Jesus Christ unto himself, according to the purpose of his will: unto the praise of the glory of his grace.” [Ephesians 1:3-6] This adoption as children, accomplished in substance by the Incarnation of the Word, is conveyed by the gift of the Spirit, which is “the spirit of adoption of sons, whereby we cry: Abba (Father).” [Romans 8:15]
This outpouring of the Spirit is granted in baptism. The time of the Church continues to be that of the great works of the Trinity. These are the sacraments that are strictly divine works, effecting a divine life in man. Thus in the time of the Church the Trinity continues to be revealed through its works. Baptism, as St. Paul has shown, conforms man to the death and Resurrection of Christ. [Romans 6:3] Thus he conveys spiritual life to man through the gift of the Spirit; and man is led through baptism to intimate contact with the Father, in the freedom of the sons of God. Thus to be a Christian is to be born into the life of the Trinity, which is the incorruptible life of God, possessed by the Three Persons and conveyed by them in a pattern of incomprehensible love.
None has described better than St. Irenaeus this birth in the Trinity:
When we are born again through baptism in the Name of the Three Persons, we are enriched, by a second birth, with the good things that are in God the Father, by means of His Son, with the Holy Spirit. Those who are baptized receive the Spirit of God, who gives them to the Word, that is, the Son; and the Son takes them and offers them to the Father, and the Father grants them incorruptibility.
Therefore without the Holy Spirit we cannot see the Word of God, and without the Son no one can come to the Father; since the knowledge of the Father is the Son, and the knowledge of the Son of God is gained by means of the Holy Spirit; but it is the Son whose function it is to distribute the Holy Spirit, according to the good pleasure of the Father, to those whom the Father chooses and in the way that the Father chooses.
Against Heresies, IV, 20, 7
But all this is a mystery that is wholly spiritual and forbidden to carnal man. Only the Holy Spirit gives us understanding of it. Carnal man has no means of grasping it by himself. This is why it remains alien to him, since it is in truth alien to him; yet the reality of the Trinity is revealed through this very strangeness. It is the hidden life of the transcendent God; and if it became accessible to carnal man it would not be one and the same.
In conveying it to man, the Trinity remains a mystery. It is not to man that it adapts itself, it is man whom it raises above himself and adapts to itself. This is why the Christian life, which is the life of the Trinity, is itself an incomprehensible mystery and a stumbling block to those who see it from outside. The darkness that conceals the Trinity from profane sight also conceals from it the mysterious acts of the Trinity in the soul of the saints.
Just as it is through the covenant that the ways of the living God are revealed to us, and that he appears to us as justice, truth, and love, so it is through adoption that the Persons are revealed to us as Father, Son, and Spirit.









