There will always be Sophists among us, stirring up division. It is best to get them out of positions of teaching, authority, or oversight. They belong in the fields and factory floor — and not as union delegates. Calvin does comment on these as he finishes his discussion of the Trinity.
18. I am not sure whether it is expedient to borrow analogies from human affairs to express the nature of this distinction. The ancient fathers sometimes do so, but they at the same time admits that what they bring forward as analogous is very widely different. And hence it is that I have a great dread of any thing like presumption here, lest some rash saying may furnish an occasion of calumny to the malicious, or of delusion to the unlearned. It were unbecoming, however, to say nothing of a distinction which we observe that the Scriptures have pointed out. This distinction is, that to the Father is attributed the beginning of action, the fountain and source of all things; to the Son, wisdom, counsel, and arrangement in action, while the energy and efficacy of action is assigned to the Spirit. Moreover, though the eternity of the Father is also the eternity of the Son and Spirit, since God never could be without his own wisdom and energy; and though in eternity there can be no room for first or last, still the distinction of order is not unmeaning or superfluous, the Father being considered first, next the Son from him, and then the Spirit from both. For the mind of every man naturally inclines to consider, first, God, secondly, the wisdom emerging from him, and, lastly, the energy by which he executes the purposes of his counsel. For this reason, the Son is said to be of the Father only; the Spirit of both the Father and the Son. This is done in many passages, but in none more clearly than in the eighth chapter to the Romans, where the same Spirit is called indiscriminately the Spirit of Christ, and the Spirit of him who raised up Christ from the dead. And not improperly. For Peter also testifies (1 Pet. 1:21), that it was the Spirit of Christ which inspired the prophets, though the Scriptures so often say that it was the Spirit of God the Father.
19. Moreover, this distinction is so far from interfering with the most perfect unity of God, that the Son may thereby be proved to be one God with the Father, inasmuch as he constitutes one Spirit with him, and that the Spirit is not different from the Father and the Son, inasmuch as he is the Spirit of the Father and the Son. In each hypostasis the whole nature is understood the only difference being that each has his own peculiar subsistence. The whole Father is in the Son, and the whole Son in the Father, as the Son himself also declares (John 14:10), “I am in the Father, and the Father in me;” nor do ecclesiastical writers admit that the one is separated from the other by any difference of essence. “By those names which denote distinctions” says Augustine “is meant the relation which they mutually bear to each other, not the very substance by which they are one.” In this way, the sentiments of the Fathers, which might sometimes appear to be at variance with each other, are to be reconciled. At one time they teach that the Father is the beginning of the Son, at another they assert that the Son has both divinity and essence from himself, and therefore is one beginning with the Father. The cause of this discrepancy is well and clearly explained by Augustine, when he says, “Christ, as to himself, is called God, as to the Father he is called Son.” And again, “The Father, as to himself, is called God, as to the Son he is called Father. He who, as to the Son, is called Father, is not Son; and he who, as to himself, is called Father, and he who, as to himself, is called Son, is the same God.” Therefore, when we speak of the Son simply, without reference to the Father, we truly and properly affirm that he is of himself, and, accordingly, call him the only beginning; but when we denote the relation which he bears to the Father, we correctly make the Father the beginning of the Son. Augustine’s fifth book on the Trinity is wholly devoted to the explanation of this subject. But it is far safer to rest contented with the relation as taught by him, than get bewildered in vain speculation by subtle prying into a sublime mystery.
20. Let those, then, who love soberness, and are contented with the measure of faith, briefly receive what is useful to be known. It is as follows:–When we profess to believe in one God, by the name God is understood the one simple essence, comprehending three persons or hypostases; and, accordingly, whenever the name of God is used indefinitely, the Son and Spirit, not less than the Father, is meant. But when the Son is joined with the Father, relation comes into view, and so we distinguish between the Persons. But as the Personal subsistence carry an order with them, the principle and origin being in the Father, whenever mention is made of the Father and Son, or of the Father and Spirit together, the name of God is specially given to the Father. In this way the unity of essence is retained, and respect is had to the order, which, however derogates in no respect from the divinity of the Son and Spirit. And surely since we have already seen how the apostles declare the Son of God to have been He whom Moses and the prophets declared to be Jehovah, we must always arrive at a unity of essence. We, therefore, hold it detestable blasphemy to call the Son a different God from the Father, because the simple name God admits not of relation, nor can God, considered in himself, be said to be this or that. Then, that the name Jehovah, taken indefinitely, may be applied to Christ, is clear from the words of Paul, “For this thing I besought the Lord thrice.” After giving the answer, “My grace is sufficient for thee,” he subjoins, “that the power of Christ may rest upon me,” (2 Cor. 12:8, 9). For it is certain that the name of Lord (Kurivo”) is there put for Jehovah, and, therefore, to restrict it to the person of the Mediator were puerile and frivolous, the words being used absolutely, and not with the view of comparing the Father and the Son. And we know that, in accordance with the received usage of the Greeks, the apostles uniformly substitute the word Kurivo” for Jehovah. Not to go far for an example, Paul besought the Lord in the same sense in which Peter quotes the passage of Joel, “Whosoever shall call upon the name of the Lord shall be saved,” (Acts 2:21; Joel 2:28). Where this name is specially applied to the Son, there is a different ground for it, as will be seen in its own place; at present it is sufficient to remember, that Paul, after praying to God absolutely, immediately subjoins the name of Christ. Thus, too, the Spirit is called God absolutely by Christ himself. For nothing prevents us from holding that he is the entire spiritual essence of God, in which are comprehended Father, Son, and Spirit. This is plain from Scripture. For as God is there called a Spirit, so the Holy Spirit also, in so far as he is a hypostasis of the whole essence, is said to be both of God and from God.
21. But since Satan, in order to pluck up our faith by the roots, has always provoked fierce disputes, partly concerning the divine essence of the Son and Spirit, and partly concerning the distinction of persons; since in almost every age he has stirred up impious spirits to vex the orthodox doctors on this head, and is attempting in the present day to kindle a new flame out of the old embers, it will be proper here to dispose of some of these perverse dreams. Hitherto our chief object has been to stretch out our hand for the guidance of such as are disposed to learn, not to war with the stubborn and contentious; but now the truth which was calmly demonstrated must be vindicated from the calumnies of the ungodly. Still, however it will be our principal study to provide a sure footing for those whose ears are open to the word of God. Here, if any where, in considering the hidden mysteries of Scripture, we should speculate soberly and with great moderation, cautiously guarding against allowing either our mind or our tongue to go a step beyond the confines of God’s word. For how can the human minds which has not yet been able to ascertain of what the body of the sun consists, though it is daily presented to the eye, bring down the boundless essence of God to its little measure? Nay, how can it, under its own guidance, penetrate to a knowledge of the substance of God while unable to understand its own? Wherefore, let us willingly leave to God the knowledge of himself. In the words of Hilary (De Trinit. lib. 1), “He alone is a fit witness to himself who is known only by himself.” This knowledge, then, if we would leave to God, we must conceive of him as he has made himself known, and in our inquiries make application to no other quarter than his word. On this subject we have five homilies of Chrysostom against the Anomoei (De Incomprehensit. Dei Natura), in which he endeavoured, but in vain, to check the presumption of the sophists, and curb their garrulity. They showed no more modesty here than they are wont to do in everything else. The very unhappy results of their temerity should be a warning to us to bring more docility than acumen to the discussion of this question, never to attempt to search after God anywhere but in his sacred word, and never to speak or think of him farther than we have it for our guide. But if the distinction of Father, Son, and Spirit, subsisting in the one Godhead (certainly a subject of great difficulty), gives more trouble and annoyance to some intellects than is meet, let us remember that the human mind enters a labyrinth whenever it indulges its curiosity, and thus submit to be guided by the divine oracles, how much soever the mystery may be beyond our reach.
Institutes of the Christian Religion Book one Chapter 13 paragraphs 18-21: John Calvin 1581