Here, we take a short look at what St. Thomas tells us about the processions in Question 27 of the First Part of the Summa. Quotes not labeled otherwise are from this treatise.
Our faith in the One but Triune God rests on the notion of persons, of which, in One God, we recognize three. To have any grasp of these Persons, we must first understand relations, and in order to do this, we must inquire as to the processions in the Trinity. “The role which the study of processions plays is propaedeutic: it prepares the way for the study of relations, which in its turn, prepares the way for us to think about the persons” (Giles Emery, pg. 51).
In the Summa Contra Gentiles, Book 4, we read that “Sacred Scripture, then, hands on to us the names of “paternity” and “sonship” in the divinity, insisting that Jesus Christ is the Son of God. Scripture has not been silent about the very name of “divine generation.” For in the Psalm (2:7), as was said, one reads: “This day have I begotten You” (Ch. 2). We certainly do not reason our way to the divine processions, but rather, present them as the teaching of revealed truth.
We must first ask then, whether there can be any processions in God, for “It would seem that there cannot be…procession signifies outward movement. But in God there is nothing mobile, nor anything extraneous.” What we must do is recognize that here, the processions are immanent, within the one God. “This objection comes from the idea of procession in the sense of local motion, or of an action tending to external matter, or to an exterior effect…This procession has been differently understood. Some have understood it in the sense of an effect, proceeding from its cause; so Arius took it…Others take this procession to mean the cause proceeding to the effect, as moving it, or impressing its own likeness on it; in which sense it was understood by Sabellius.”
Of course, these errors are easy to fall into, as this is our experience in the world around us. Actions tend to terminate in other objects, or in other locations, or in other times. But we can, as Augustine showed us, and Thomas refined so well, see an analogous procession in ourselves in our intellect and in our will, allowing us to have some understanding of what immanent (internal) processions might be.
“As God is above all things, we should understand what is said of God, not according to the mode of the lowest creatures, namely bodies, but from the similitude of the highest creatures, the intellectual substances… Procession, therefore, is not to be understood from what it is in bodies, either according to local movement or by way of a cause proceeding forth to its exterior effect, as, for instance, like heat from the agent to the thing made hot. Rather it is to be understood by way of an intelligible emanation.”
After showing that, within God who is pure simplicity, there can still be processions, we move to the question of generation. “Generation has a twofold meaning: one common to everything subject to generation and corruption…for this kind of generation requires that there should be a procession by way of similitude in the same specific nature; as a man proceeds from a man, and a horse from a horse…In another sense it is proper and belongs to living things; in which sense it signifies the origin of a living being from a conjoined living principle.”
Now, in God, what is generated does not have its terminus in another subject, as it would in creatures. When a human begets a human, the nature is shared, but the subject is a different human, in different matter and with its own form. It is this creaturely part of generation we must let go of when thinking of God.
“But if there is a being whose life does not proceed from potentiality to act, procession (if found in such a being) excludes entirely the first kind of generation; whereas it may have that kind of generation which belongs to living things [but] by way of similitude, inasmuch as the concept of the intellect is a likeness of the object conceived:–and exists in the same nature, because in God the act of understanding and His existence are the same.”
As St. Thomas says elsewhere, “That, then, is the supreme and perfect grade of life which is in the intellect, for the intellect reflects upon itself and the intellect can understand itself… God, because He understands Himself, the intellect, the thing understood, and the intention understood are all identical. God, therefore, must be in Himself as the thing understood in him who understands… The divine intellect, of course, since it does not pass from potency to act, but is always actually existent (which was proved in Book I), must necessarily have always understood itself and is co-eternal with God, and is not acquired by Him in time, as our intellect acquires in time its interiorly conceived word which is the intention understood” (SCG, IV, 11) As Fr. Lagrange puts it, “the Word, conceived from eternity by the Father, has no other nature than that of the Father. And the Word is not like our word, accidental, but substantial, because God’s act of knowledge is not an accident, but self-subsisting substance” (Reality). We touched on this when asking if there were any procession in God, and what kind of procession (immanent) that might be.
But an objection may be placed here, if one has not grasped what was said above. It would seem that “anything that is generated derives existence from its generator. Therefore such existence is a derived existence.” Thomas reply is that “…what is generated in God receives its existence from the generator, not as though that existence were received into matter or into a subject…but… He Who proceeds receives divine existence from another; not, however, as if He were other from the divine nature.” This had been recently defined by the Church: The Fourth Lateran Council…declared…(The Divine Substance) does not generate, nor is it generated, nor does it proceed; it is the Father that generates, the Son who is generated, and the Holy Ghost that proceeds (Dogma, pg. 61)
We have spoken of generation, and this applies to the Word of God, whom we generally refer to as the Second Person of the Trinity. But can any other procession exist? As stated earlier, we can have some understanding of the answer to this by looking within ourselves, for we were created in the image and likeness of God. “We must observe that procession exists in God, only according to an action which does not tend to anything external, but remains in the agent itself. Such an action in an intellectual nature is that of the intellect, and of the will.”
The first procession, that of the generation of the Word, refers to the intellect. When we turn to the procession of the Holy Ghost, we will speak analogously of the will. We might ask what difference there is in the procession of the Word and of the Holy Ghost, and why, if we call the first generation, we do not likewise call the procession of the Holy Ghost generation.
Fr. Lagrange puts it succinctly. “Further, this procession of the only-begotten Son is rightly called generation. The living thing, born of a living thing, receives a nature like that of its begetter, its generator. In the Deity, the Son receives that same divine nature, not caused, but communicated…But this second procession is not a generation, because love, in contrast with knowledge, does not make itself like its object, but rather goes out to its object…The second procession, spiration, presupposes the first, generation, since love derives from knowledge.”
Thomas tells us, as far as using the word procession and generation for the Son, but only the word procession for the Spirit, “As in creatures generation is the only principle of communication of nature, procession in God has no proper or special name, except that of generation. Hence the procession which is not generation has remained without a special name; but it can be called spiration, as it is the procession of the Spirit.”
There are, besides intellect and will, other perfections on God, such as power, goodness, and others. Are there, then, other processions in God? “It would seem to some that… there are more than two processions in God, for goodness seems to be the greatest principle of procession, since goodness is diffusive of itself. Therefore there must be a procession of goodness in God. But, As Boethius says (De Hebdom.), goodness belongs to the essence and not to the operation, unless considered as the object of the will.”
In other words, “The divine processions can be derived only from the actions which remain within the agent. In a nature which is intellectual, and in the divine nature these actions are two, the acts [are] of intelligence and of will.”
In summary, we may reflect on the processions in the following way:
- Our intellectual ideas are accidental, not substantial. God’s are substantial; it does not develop in time, as though it was discursive. He has but one idea, one Word, that of Himself.
- This Word is begotten, generated, for knowledge makes itself like its object.
- The Holy Ghost proceeds as love, which does not make itself like its object, and thus in God is not by generation, but rather, love goes out to its object, and this, we may call spiration.
- To again quote LaGrange, “The second procession, spiration, presupposes the first, generation, since love derives from knowledge.” From this, we can know the Father as first principle, but also that the Holy Ghost proceeds from both the Father and the Son as from one principle.