The names "Father" and "Son" presuppose one another; neither can exist without the other.The Son's origin can be described using the concept of birth in an analogical manner, and also how this concept stemming from the material world can be applied to the inner life of the Trinity. In this entry, we will deal with another name used for the second divine person in the prologue of John's Gospel (Jn 1:1-18). John the Evangelist calls Jesus "Logos" in Greek, which could simply be translated as "Word." The persons of the Trinity do not differ from the divine nature, only contrasting with one another: the difference between them is a difference marked by opposing references, relations. The names "Father" and "Son" clearly refer to this difference. However, in the case of the name "Word" ("Speech"), the interdependence and difference are not so striking. In everyday use, a word serves to communicate some intellectual, spiritual content with others; it has a sound form or is a series of written signs. In God's case, a word tied to the material world in this way can only be used in an analogous sense. However, the word used in this sense also has an essential aspect: someone utters (writes) the word. Therefore, the concept of the word inherently contains a reference: the word is uttered by someone, the word is referred to its speaker, the origin of the word refers to the speaker's activity.
If we purify the word from its material characteristics, sound form (written signs), and consider what the word refers to, we reach the intellectual content, concept, "inner word," signaled by the external word. Regarding the Trinitarian origins, we talked about how, starting with Augustine, Western theology considers the Son's birth, the Word, to be of intellectual origin. As a result of human understanding, the concept of the object is formed in the mind from the known object. The external, spoken or written word refers to this. The concept designates two aspects: on the one hand, it refers to the object about which the concept is, and on the other hand, it refers to the knowing subject, that is, to the one whose knowledge of the object embodies in the concept. These relations clearly indicate both the interconnection and the differences. The knowing subject is not identical to the concept, as there might have been a time when he did not yet know the object and thus had no concept of it. Similarly, the concept is not identical to the object of the concept; it differs from it. Often it concerns the objects of the external world, from which the knowable, the intelligible, is transmitted to the intellect by sensory organs, and the concept is formed through the processing activity of the intellect. The relationship between the knowing subject and the concept formed by his knowledge can be described with the substance-attribute concept pair: the knowing subject is the substance that carries the result of the knowledge, the concept.
Because of God's simplicity, the knower and the known, the divine intellect, and the divine nature are identical. Therefore, the duality of the concept and the object of the concept is not found in the divine nature in the sense that we encounter it in our created world. In God, there cannot be such a duality of the concept and the object of the concept that would, in some sense, divide the utterly simple divine essence. The divine intellect, which is identical to the divine nature, does not differ from the divine persons. However, at the same time, the operation of the unified divine intellect can be referred to the individual persons according to the peculiarities of the persons: the Father as a father, the Son as a son, the Holy Spirit as a holy spirit, without this dividing the unity of operation. This is not the case because the intellectual recognition of the individual persons does not create differences in the recognition itself; the differences are only in the relationships between the persons, but these are real, person-constituting differences.
In Thomas Aquinas' conception of the Trinity, the key concept is the self-standing, carrier-less reference (relatio subsistens). Fatherhood, sonship, and spiration are the self-existing references of the persons of the Trinity, the Father, the Son, and the Holy Spirit. These references are not carried by the divine essence. In our created world, the references do not stand on their own; they are always carried by some subject. The references differ from their carrier subjects, the reference is one thing, and its carrier subject is another. In the Trinity, however, the references designating the persons have no carrier subjects; they exist without a carrier subject. The divine nature cannot be considered their carrier subject, because if it were, then the persons would differ in something from the divine nature, and then it could no longer be said that every Trinitarian person is fully God. The Trinitarian persons are identical with the divine nature, and no difference can be established between the divine nature and them; the differences are only between the persons themselves: these differences signify that they are non-interchangeable persons.
Based on the above, it is clear that the word "Word" cannot signify some content of the common divine knowledge, but at the same time cannot be considered an external metaphor either. The use of the word "Word" gives insight into the mystery of the Trinity, but the ultimate incomprehensibility of the mystery does not cease even then. The Son's birth from the Father is analogous to the process in which a concept is born as a result of the intellect's cognitive activity. The word concept, by the way, is related to the word conception, as the Latin word conceptus also refers to conceptio. In human knowledge, the process of knowing can be a long process, and its result, the concept, is only an appendage to the knowing subject. The source of the eternal birth of the Word is not the operation of the divine intellect, since this is common to every person. The source of the Word's birth in the divine intellect's knowledge is the recognition of the Father as Father. According to the above, it is only in relation to the Son and the Holy Spirit, in contrast to them, that one can speak of this, the recognition as father, because this does not bring any division into the operation of the divine intellect. The "recognition as father" does not mean some specific part of divine knowledge that would be only the Father's. The recognition as father results from considering the personal characteristics of the Father, the reference of fatherhood, in connection with the divine intellect. In the recognition of the Father as father, he expresses himself by eternally, in eternal love, pronouncing the Word, who is as much God as he is, and who differs from him only in being pronounced. The pronouncement of the Word signifies the same thing as the birth of the Son from the Father; the Word and the Son are the same, the birth and the pronunciation by the Father are the same. It is therefore an approach to the father-son reference from the side of the divine intellect.
In the above sense, therefore, the Word is the fruit of the Father's self-knowledge, which is not some incidental content of the divine intellect but a divine person. Starting from this, let us deal with the further characteristics of the person of the Word, with the Trinitarian attributions related to the Word.
After examining the name "Word" given to the second divine person, this name points to the intellectual nature of the Son's origin from the Father. Starting from this, we can approach several names and attributions mentioned in the Scriptures. In the Trinitarian attributions (appropriationes), we attribute a name or property relating to the divine essence to a divine person because the name or property particularly reflects the person's distinctiveness. Thus, divine wisdom can be attributed to the Word, as the Word is the expression of the Father's knowledge and wisdom. That is why Thomas Aquinas refers to the Word as conceived or born Wisdom (sapientia concepta vel nata, Summa Contra Gentiles IV. 12).
Wisdom is a word with many meanings. Perhaps human wisdom can be described as the fullness of knowledge. However, this knowledge is not merely the sum of partial insights but a coherent knowledge illuminated by causes and relationships, where details do not obscure the whole but find their place within it. Aristotle relates wisdom to the knowledge of the "highest things." Since God is the highest, the ultimate cause and creator of everything, wisdom emanates from God and refers everything to Him. Wisdom, therefore, views the world primarily as God's creation, and interprets personal life and world events in terms of the work of redemption. From God's perspective, wisdom is the wisdom of the creating, providential, and redeeming God. The term "born Wisdom" is a good expression as it alludes both to the common, essential wisdom of the three persons (since the persons are identical with the divine essence, and this is identical with divine wisdom) and to the way in which it eternally comes into being in the Word. The Word is thus the knowledge, self-knowledge, and wisdom of God emanating from the Father, expressed by the Father. The divine self-knowledge, knowledge, and wisdom are the self-knowledge, knowledge, and wisdom of all three persons through the common divine nature, but in the Word, this is the knowledge and wisdom originating from and expressed by the Father.
The Letter to the Hebrews (1:3) refers to the Son as the brightness of the Father's glory and the image of the Father. The concept of an image or imago is taken from the created world, primarily from human creations. This concept inherently contains reference to the original. The more perfect the image, the more it resembles what it depicts. At first glance, it may seem that if the original is available, there is no need for the image. The necessity of the image arises only from the imperfection that the original is not at hand. One might similarly opine about the duality experienced in intellectual recognition, where knowledge is some kind of image of the known object. In our created world, the aspects of original and image, known object, and knowledge of it carry imperfection: the image is never entirely identical with the original, knowledge never fully knows the known object. The image and the original, knowledge, and known object essentially differ in existence. Metaphysics seeks to explain the unity and plurality, agreement, and discrepancy found in our empirical world. The explanation points to the complexity and limited existence of things. In one entry, we already mentioned that the "supernatural continuation" of metaphysics is found in the mystery of the Trinity, which illuminates that diversity is not merely due to the limitations of created existence. The difference determined by subsistent relations (relationes subsistentes) is as much a fundamental structure of complete existence as existence's unity. As complete existence coincides with complete goodness, so complete existence coincides with the three persons and their mutual relations. While natural reason can perceive the identity of complete existence with complete goodness, we cannot even approach the latter identity without God's revelation. In the fullness of intellectual life identical to complete existence, there is, in some sense, the duality of original and image, known, and knowledge, familiar from the created world. However, this duality is applied to God analogically. In God, the difference manifesting in the origins is not a difference based on varying substances. The original and the image, the known, and knowledge are essentially the same, with the only distinction arising from the eternal relationship of origin between them.
The Word's origin from the Father without origin and the created beings' origin from the uncreated God are in "structural" kinship with each other. There is a similarity between the Word and created beings because each of them is some endpoint of origin, a terminus. The endpoint of the Word's origin from the Father is the Word, consubstantial with the Father. This origin is an internal origin within God; its endpoint is also within God, and it cannot be considered a causal relationship in the strict sense. The origin of created beings is a causal relationship in the strict sense, resulting not in consubstantiality with God but in limited existence, distinct from God. However, there is a connection between created beings and the Word, resulting in the Word being considered the archetype of creation, and the origin of created beings being understood as a (limited) participation in the Word's origin as a model. Thus, the study of the Trinity seeking to approach God's inner life also illuminates the roles of the divine persons in creation and the history of salvation. For a more detailed description of this, we rely again on Gilles Emery OP's book: The Trinitarian Theology of St Thomas Aquinas, Oxford, 2010.
As we have seen, the knowledge of the Word comes from the Father, knowledge expressed by the Father. This knowledge extends to the possibilities of creating things similar to the divine nature, i.e., the possibilities of creation itself. Of these, the divine will freely chose our world, the created beings of our world. God knows the created beings not through some experience, but through His own knowledge, as the ideas of creation are in the divine nature. Therefore, divine knowledge includes the full depth of created existence, as it is the knowledge of the Creator. The Word, the knowledge expressed by the Father, thus includes the precise "blueprint" of creation, just as the plan of the house is present in the mind of the house's designer. God's word, however, is a creating word, a creating Word. In the Scriptures, we often read that God says something, and it becomes reality simply by God pronouncing it. The six-day creation narrative repeats like a refrain that God's word "let there be" is a "calling into being" word: "And God said, 'Let there be light!' And there was light" (Gen 1:3). The work of creation and the preservation of the world originate from the Father, and are realized through the utterance of the Father's Word, the Word. Therefore, the Letter to the Hebrews says (1:1-3):
"In the past God spoke to our ancestors through the prophets at many times and in various ways, but in these last days, He has spoken to us by His Son, whom He appointed heir of all things, and through whom also He made the universe. The Son is the radiance of God's glory and the exact representation of His being, sustaining all things by His powerful word."
Thomas Aquinas deals with why it was especially fitting (convenient) for the Word among the three persons to become incarnate (Summa Theologiae III q.3.a.8). The main point Thomas Aquinas sees is the similarity between the Word and the creatures mentioned above. The person of the Word was especially suitable to become the firstborn of all creation after the incarnation and to restore the world corrupted by sin according to the original pattern. The apostle Paul writes (Col 1:15-17):
"He is the image of the invisible God, the Firstborn over all creation. For in Him all things were created: things in heaven and on earth, visible and invisible, whether thrones or powers or rulers or authorities; all things have been created through Him and for Him. He is before all things, and in Him all things hold together."
Thomas Aquinas mentions three degrees regarding the similarity of creatures to the Word. The first degree applies to every creature: here the basis of similarity is that both the Word and the creatures originate from some source. The second degree includes rational creatures, where the similarity is greater due to their rationality. The third degree refers to the supernatural order. This similarity is related to the Son's origin from the Father and is manifested in supernatural divine sonship. The justified person, in the state of sanctifying grace and then in the beatific vision of God (visio beatifica) of salvation, partakes in the life of the Trinity based on similarity to the Son as the Son of the Father.