The ancient “rule of faith” was a doctrinal standard employed by the early churches. It was used as a baptismal creed, a creed memorized by new converts and recited prior to baptism (off of which later creeds like that of Nicea and Arminium were based). Following the baptismal formula instituted by Christ, to baptize in the name of the Father, the Son, and the Holy Spirit, the ancient baptismal creed followed this same outline, giving a brief confession of the identities of the Father, Son, and Spirit, coupled with a brief summary of the gospel under the head of the Son’s identity. In this way the ‘rule of faith’ can be seen as a summary of the Christian faith as presented in the scriptures, summarizing the identity of the Father, the Son, and the Spirit, and the message of the gospel, as Paul said he delivered “as of first importance” in 1 Corinthians 15.
This ancient summary of the faith was held to by the churches as the teaching they had received from the apostles, which they had received from oral tradition, and was confirmed by demonstration from the holy scriptures. Irenaeus of Lyons, for example sets forth this rule as the standard of true Christian doctrine in both his Against Heresies, and his Demonstration of the Apostolic Preaching. In Against Heresies he uses the rule of faith as the standard of Christian orthodoxy, against which the heretical claims of the various pseudo-gnostic sects were set in contradiction. Their contradiction of the rule of faith showed them to be heretics; on the other hand, faithful adherence to the rule would prevent one from falling into heresy. In Demonstration of the Apostolic Preaching, Irenaeus sets about demonstrating each point of the rule of faith from the holy scriptures, showing thereby that each point is beyond a doubt known to be true.
In Against Heresies, Irenaeus sums up the rule as follows:
“1. The Church, though dispersed through our the whole world, even to the ends of the earth, has received from the apostles and their disciples this faith: [She believes] in one God, the Father Almighty, Maker of heaven, and earth, and the sea, and all things that are in them; and in one Christ Jesus, the Son of God, who became incarnate for our salvation; and in the Holy Spirit, who proclaimed through the prophets the dispensations of God, and the advents, and the birth from a virgin, and the passion, and the resurrection from the dead, and the ascension into heaven in the flesh of the beloved Christ Jesus, our Lord, and His [future] manifestation from heaven in the glory of the Father “to gather all things in one,” and to raise up anew all flesh of the whole human race, in order that to Christ Jesus, our Lord, and God, and Saviour, and King, according to the will of the invisible Father, “every knee should bow, of things in heaven, and things in earth, and things under the earth, and that every tongue should confess” to Him, and that He should execute just judgment towards all; that He may send “spiritual wickednesses,” and the angels who transgressed and became apostates, together with the ungodly, and unrighteous, and wicked, and profane among men, into everlasting fire; but may, in the exercise of His grace, confer immortality on the righteous, and holy, and those who have kept His commandments, and have persevered in His love, some from the beginning [of their Christian course], and others from [the date of] their repentance, and may surround them with everlasting glory.” (Book 1, Chap 10.)
He goes on to explain:
“2. As I have already observed, the Church, having received this preaching and this faith, although scattered throughout the whole world, yet, as if occupying but one house, carefully preserves it. She also believes these points [of doctrine] just as if she had but one soul, and one and the same heart, and she proclaims them, and teaches them, and hands them down, with perfect harmony, as if she possessed only one mouth. For, although the languages of the world are dissimilar, yet the import of the tradition is one and the same. For the Churches which have been planted in Germany do not believe or hand down anything different, nor do those in Spain, nor those in Gaul, nor those in the East, nor those in Egypt, nor those in Libya, nor those which have been established in the central regions of the world. But as the sun, that creature of God, is one and the same throughout the whole world, so also the preaching of the truth shineth everywhere, and enlightens all men that are willing to come to a knowledge of the truth. Nor will any one of the rulers in the Churches, however highly gifted he may be in point of eloquence, teach doctrines different from these (for no one is greater than the Master); nor, on the other hand, will he who is deficient in power of expression inflict injury on the tradition. For the faith being ever one and the same, neither does one who is able at great length to discourse regarding it, make any addition to it, nor does one, who can say but little diminish it.” (Ibid)
In Demonstration of the Apostolic Preaching, he sums it up in these words:
“This then is the order of the rule of our faith, and the foundation of the building, and the stability of our conversation: God, the Father, not made, not material, invisible; one God, the creator of all things: this is the first point of our faith. The second point is: The Word of God, Son of God, Christ Jesus our Lord, who was manifested to the prophets according to the form of their prophesying and according to the method of the dispensation of the Father: through whom all things were made; who also at the end of the times, to complete and gather up all things, was made man among men, visible and tangible, in order to abolish death and show forth life and produce a community of union between God and man. And the third point is: The Holy Spirit, through whom the prophets prophesied, and the fathers learned the things of God, and the righteous were led forth into the way of righteousness; and who in the end of the times was poured out in a new way upon mankind in all the earth, renewing man unto God.”
He goes on to explain that the rule is grounded in the baptismal formula of Matthew 28:
“And for this reason the baptism of our regeneration proceeds through these three points: God the Father bestowing on us regeneration through His Son by the Holy Spirit. For as many as carry (in them) the Spirit of God are led to the Word, that is to the Son; and the Son brings them to the Father; and the Father causes them to possess incorruption. Without the Spirit it is not possible to behold the Word of God, nor without the Son can any draw near to the Father: for the knowledge of the Father is the Son, and the knowledge of the Son of God is through the Holy Spirit; and, according to the good pleasure of the Father, the Son ministers and dispenses the Spirit to whomsoever the Father wills and as He wills.”
Tertullian similarly employed the rule of faith against heretics. He describes the rule of faith as the dogmatic standard of Christianity, a summary of the faith, which was beyond question to true Christians. No contradiction of the rule was to be allowed; such was heresy, and made the one denying the rule no true Christian at all. On the other hand, areas of theology which were not addressed in the rule were regarded as something that Christians were free to search out a knowledge of from the scriptures, to speculate on, and to disagree with one another on. The rule of faith was the standard of Christian doctrine which could not be denied; doctrines not addressed in it were free to be explored. In his book Against Praxeas, Tertullian sums up the rule as follows:
“We, however, as we indeed always have done (and more especially since we have been better instructed by the Paraclete, who leads men indeed into all truth), believe that there is one only God, but under the following dispensation, or οἰκονομία, as it is called, that this one only God has also a Son, His Word, who proceeded from Himself, by whom all things were made, and without whom nothing was made. Him we believe to have been sent by the Father into the Virgin, and to have been born of her — being both Man and God, the Son of Man and the Son of God, and to have been called by the name of Jesus Christ; we believe Him to have suffered, died, and been buried, according to the Scriptures, and, after He had been raised again by the Father and taken back to heaven, to be sitting at the right hand of the Father, and that He will come to judge the quick and the dead; who sent also from heaven from the Father, according to His own promise, the Holy Ghost, the Paraclete, the sanctifier of the faith of those who believe in the Father, and in the Son, and in the Holy Ghost. That this rule of faith has come down to us from the beginning of the gospel, even before any of the older heretics, much more before Praxeas, a pretender of yesterday, will be apparent both from the lateness of date which marks all heresies, and also from the absolutely novel character of our new-fangled Praxeas.” (Chapter 2)
In Against Heresies, Tertullian gives the following summary of the rule, and explanation regarding a Christian’s freedom to speculate on other doctrines:
“Now, with regard to this rule of faith— that we may from this point acknowledge what it is which we defend — it is, you must know, that which prescribes the belief that there is one only God, and that He is none other than the Creator of the world, who produced all things out of nothing through His own Word, first of all sent forth; that this Word is called His Son, and, under the name of God, was seen in diverse manners by the patriarchs, heard at all times in the prophets, at last brought down by the Spirit and Power of the Father into the Virgin Mary, was made flesh in her womb, and, being born of her, went forth as Jesus Christ; thenceforth He preached the new law and the new promise of the kingdom of heaven, worked miracles; having been crucified, He rose again the third day; (then) having ascended into the heavens, He sat at the right hand of the Father; sent instead of Himself the Power of the Holy Ghost to lead such as believe; will come with glory to take the saints to the enjoyment of everlasting life and of the heavenly promises, and to condemn the wicked to everlasting fire, after the resurrection of both these classes shall have happened, together with the restoration of their flesh. This rule, as it will be proved, was taught by Christ, and raises among ourselves no other questions than those which heresies introduce, and which make men heretics. So long, however, as its form exists in its proper order, you may seek and discuss as much as you please, and give full rein to your curiosity, in whatever seems to you to hang in doubt, or to be shrouded in obscurity. You have at hand, no doubt, some learned brother gifted with the grace of knowledge, some one of the experienced class, some one of your close acquaintance who is curious like yourself; although with yourself, a seeker he will, after all, be quite aware that it is better for you to remain in ignorance, lest you should come to know what you ought not, because you have acquired the knowledge of what you ought to know. Your faith, He says, has saved you Luke 18:42 not observe your skill in the Scriptures. Now, faith has been deposited in the rule; it has a law, and (in the observance thereof) salvation.” (Chapter 13-14)
Similarly, the rule of faith was, as mentioned above, used as the baptismal creed of the various churches. The ancient creed of Jerusalem, for example, read thus:
“I believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible;
And in one Lord Jesus Christ, the only begotten Son of God, begotten of the Father before the ages, true God, by whom all things were made, who was incarnate and made man, crucified and buried, and the third day ascended into the heavens, and sat down at the right hand of the Father, and is coming to judge quick and dead.
And in the Holy Ghost, the Paraclete, who spake by the prophets;
And in one holy catholic Church; and resurrection of the flesh; and in life everlasting.”
All of these summaries of the Christian faith contain, as Irenaeus said, a skeleton of three articles: 1) the identity of the Father, 2) the identity of the Son, and 3) the identity of the Holy Spirit. The ancient heresies the church faced were considered heresies precisely because they contradicted this rule in one way or another. Docetism, for example, denied the second article of the faith by denying the real humanity and real death and passion of Christ. The gnostic heresies denied the identity of the Maker of all things and the Father of the Lord Jesus Christ, thus denying the first article of the faith. The Modalists, by teaching that all three persons of the Trinity were one God, one person, denied the second and third articles of the faith by seeking to take away the distinct existence of the Son and Spirit as distinct persons from the Father, and so denied the first as well by denying the true fatherhood of God. All these heresies had in common that they struck at the true identities of the persons of the Father, the Son, and the Spirit; by doing so, they set themselves in opposition to true Christianity.
A critical examination of semi-modalism (as summed up, for instance, in the Pseudo-Athanasian Creed) in relation to the rule of faith shows that like the aforementioned heresies, semi-modalism denies the rule of faith as well. A complex and self-contradictory idea in itself, semi-modalism contradicts the rule of faith on multiple points. Semi-modalism is the belief that the Trinity is one person who is three persons, Father, Son, and Holy Spirit; the three persons are confessed to be equal in authority, and to together be “one God”. This one God, the Trinity, is deemed to be the Almighty, and the Maker of all things.
In sum, semi-modalism denies the rule of faith in the following ways:
1) Semi-modalism denies the first article of the faith by teaching the non-identity of the Father and the one God.
2) Semi-modalism denies the first article of the faith by denying that the Father is the Almighty.
3) Semi-modalism, by making all three persons of the Trinity into a single person, denies the second and third articles of the faith by taking away the distinct existence of the Son and Spirit as two distinct persons besides the one God.
4) Semi-modalism denies the second article of the faith by denying that Christ is the Son of the one God.
Let’s examine each point:
Firstly, semi-modalism denies the first article of the faith by teaching the non-identity of the Father and the one God. This is the most immediately obvious way that semi-modalism contradicts the rule of faith; while the ancient rule of faith begins by confessing with the scriptures that the one God is the Father particularly (1 Cor 8:6, Eph 4:6), semi-modalism defines the one God as the Father, Son, and Holy Spirit together. This difference is highly significant when we recall that the purpose of these statements is to correctly identify the persons of the Trinity; who is the Father? The rule of faith answers, ‘the one God, the Almighty, the Maker of all things’. Or asked conversely, Who is the one God? The rule of faith answers clearly: the Father, the Almighty, the Maker of all. Semi-modalism changes these answers, and takes these prerogatives away from the Father, applying them instead to the Trinity conceived of as a single person.
Since this first point focuses on the Father’s identity as the one God, let’s begin there. Godhood, biblically, is dominion; to be God is to possess dominion. As Sir Isaac Newton observed:
“This Being [God] governs all things, not as the soul of the world, but as Lord over all: And on account of his dominion he is wont to be called Lord God Pantokrator [Greek word usually translated “Almighty”], or Universal Ruler. For God is a relative word, and has a respect to servants; and Deity is the dominion of God, not over his own body, as those imagine who fancy God to be the soul of the world, but over servants. The supreme God is a Being eternal, infinite, absolutely perfect; but a being, however perfect, without dominion, cannot be said to be Lord God; for we say, my God, your God, the God of Israel, the God of Gods, and Lord of Lords; but we do not say, my Eternal, your Eternal, the Eternal of Israel, the Eternal of Gods; we do not say, my Infinite, or my Perfect: These are titles which have no respect to servants. The word God usually signifies a Lord; but every lord is not a God. It is the dominion of a spiritual being which constitutes a God; a true, supreme, or imaginary dominion makes a true, supreme, or imaginary God.” (Newton, General Scholium)
For the Father to be God, then, denotes His dominion; that He is called simply “God” without qualification, and “the one God” (1 Cor 8:6), and “the only true God” (John 17:3), then, is on account of His supreme dominion over all, as Eph 4:6 says, “one God and Father of all who is over all and through all and in all.” (NASB) That He is called the “one God” and “only true God” are not said to deny that the word “God” may be used of other persons, but by way of eminence, as denoting that He is supreme over all. As Paul wrote in 1 Cor 8:5-6, “For though there be that are called gods, whether in heaven or in earth, (as there be gods many, and lords many,) 6 But to us there is but one God, the Father, of whom are all things, and we in him; and one Lord Jesus Christ, by whom are all things, and we by him.” (KJV). It is clear, then, that the rule of faith is wholly correct in declaring that the one God is the Father in particular.
Semi-modalism, on the other hand, denies this title to the Father, and gives it to a person who does not in reality exist, the Trinity conceived of as a person. That the Trinity is believed to be a person is clear from, among other things, the very fact that the title “one God” is applied to it. For let us consider what the significance of the phrase is: as we have said, Godhood, or deity, is dominion; corresponding to this, a God, then, is by definition a person who possesses Godhood; just as a Lord is a person who possesses lordship, and a King is a person who possesses regal authority. To call something a “God”, then, denotes that it is a person who possesses Godhood, that is, dominion (for which reason judges and saints in the Old Testament, could be called “gods”, and Satan, as the wicked ruler of this world, and as possessing a degree of dominion over the world, is called “the god of this world”). To call the Trinity a God, “one God”, then, is to declare the Trinity, according to the very meaning of the term “God”, to be a person who possesses Godhood (or dominion). To declare the Trinity to be one God is to take a personal title, which can only be used of a single person, and apply it to the Trinity: thus in declaring the Trinity to be “one God” semi-modalism necessarily confesses the Trinity to be a single person.
This person is treated as such; he is also called “one Lord” according to the pseudo-Athanasian Creed, another title that properly denotes a single person who possess lordship, thus again affirming the personhood of the Trinity as a whole. Likewise, in semi-modalism the Trinity is treated as a person by the ubiquitous usage of singular personal pronouns for the Trinity as a whole, and the Trinity, spoken of under such language, even receives prayer and hymns directed to it as its own person; for example:
“This is our God;
This is one God;
This is the one and only God;
O Blessed Trinity.
To him we all pray,
The one whom we implore,
The one who is Father, Son and Holy Spirit,
O Blessed Trinity.” (3rd Hymn of Marius Victorinus)
The identity of the person who has supreme dominion over all, as is denoted by the phrase, “one God”, then, is according to semi-modalism a person never mentioned in the scriptures, a person who is the Trinity itself as a whole. This is contrary to the scriptural claim of the rule of faith, which expressly identifies the “one God”, that person who possesses dominion over all, as the Father in particular. Semi-modalism seeks to take this unique prerogative away from the Father, and give it to another person; it is clear then, that semi-modalism here contradicts the ancient rule of faith.
The second point upon which semi-modalism contradicts the rule of faith is very similar to the first: Semi-modalism denies the first article of the faith by denying that the Father is the Almighty.
The ancient rule of faith almost always includes this detail, that not only is there one God, the Father, but that He is Almighty. To modern ears this may seem strange; our conception of what is signified by “Almighty” usually pertains to strength in the sense of ability; it is one of many divine attributes, and its constant inclusion in the first article of the rule of faith can seem out of place. Why only list one of many attributes, and always that one?
The reason for this is because “Almighty” in its original meaning was not talking about ability or strength, but authority; the Greek word rendered “Almighty” is ‘Pantokrator’, which literally means, ‘Ruler over all’, or ‘Supreme Ruler’. Not talking about innate or natural ability at all, but about authority, this term is limited by scripture to the person of the Father alone, and the early church, likewise kept this association. Its inclusion in the rule of faith can be seen as an explanation of what is meant by “One God”: there is one God, because there is one Almighty, one Pantokrator, only one person Who has supreme dominion and authority over all absolutely- the Father.
As we said above, this is the essence of Christian monotheism; while there are many to whom the word “god” can be applied to in a limited sense, there is only one, according to the scriptures, who has dominion over all absolutely, and so, one God, the Father. As all things are from the Father, and He has dominion over all that is from Him, so He rightly has dominion over all things. As Irenaeus said “God is not ruler and Lord over the things of another, but over His own; and all things are God’s; and therefore God is Almighty, and all things are of God.” (Demonstration of the Apostolic Preaching)
The theological significance of the term “Almighty” then, has to do primarily with authority, not natural ability. Since this term then signifies a ‘Supreme Ruler’, it is firstly evident that the title must belong to a person, since all rulers are necessarily persons; and secondly, it is evident that this title can belong to only one person, and no more, by the very nature of its meaning. To be Ruler over all, or Supreme Ruler, Almighty, is to have dominion over all absolutely; this then admits of no equal, since if there were another with equal authority, then the original subject, not being Ruler over His equal, would not be Ruler over all. If there is an Almighty, a Pantokrator, then, He alone can be such, by the very definition of the term; and the rule of faith, like scripture, clearly tells us this is the Father, Who is the One God.
Semi-modalism, however, insists on making all three persons of the Trinity equal in authority:
“13. So likewise the Father is almighty, the Son almighty, and the Holy Spirit almighty…. 25. And in this Trinity none is afore or after another; none is greater or less than another. 26. But the whole three persons are coeternal, and coequal.” (Pseudo-Athanasian Creed)
This declaration that the Son and Spirit have equal authority with the Father, then, is a denial that the Father is Almighty. It is not possible to have three with equal authority, and yet have a supreme authority; none having greater authority over the other, none is supreme over the others, and so there is no absolutely supreme authority. If the three persons are equal, none of them rules over all, none is Pantokrator, none is Almighty. Semi-modalism is then, on this point squarely opposed to the rule of faith.
But semi-modalism, nonetheless, being self-contradictory, claims nonetheless that there is one Almighty- the Trinity as a person.
“14. And yet they are not three almighties, but one Almighty.” (Pseudo-Athanasian Creed)
Again, the Trinity is clearly treated as a single person in this case, since it is being declared to be the Supreme Ruler over all. If the Trinity is then a ruler of any kind, then it is, according to the meaning of the words, a person who rules; no ruler is not a person. Semi-modalism then once again attempts to rob the Father of one of his prerogatives and apply it instead to the Trinity conceived of as a person.
In sum, semi-modalism, when it declares the Trinity to be one person who is Almighty, declares the Almighty to be a different person than the rule of faith does; on the other hand, if a semi-modalist objects that they do not think the Trinity is a person, yet make the persons out to be equal in authority, they will still deny the rule of faith, by denying not only that the Father is Almighty, but that there is any Almighty, any Supreme Ruler over all, at all. All-in-all, semi-modalism shows itself to be irreconcilably at odds with the rule of faith on both the identity of the one God, and the identity of the Supreme Ruler over all, both of Whom the rule declares to be one and the same person, the Father.
In our third point, we consider that semi-modalism denies the second and third articles of the faith by taking away the distinct existence of the Son and Spirit as two distinct persons besides the one God, by making all three persons of the Trinity into a single person. By making the Trinity out to be a single person, as classical modalism did, semi-modalism denies the real identities of the Son and Holy Spirit. To put the matter simply: in the rule of faith, the Son and Spirit are two distinct persons besides the one God; in semi-modalism, the Son and Spirit are effectively part of the one God as “persons of” or “within” the one God.
We see this come to bear especially clearly in scholastic articulations of semi-modalism. In short, the Father, Son, and Spirit are defined as not being three individual realities (that is three persons), but as only one individual reality, as per the Fourth Lateran Council.
“We, however, with the approval of this sacred and universal council, believe and confess with Peter Lombard that there exists a certain supreme reality, incomprehensible and ineffable, which truly is the Father and the Son and the holy Spirit, the three persons together and each one of them separately. Therefore in God there is only a Trinity, not a quaternity, since each of the three persons is that reality — that is to say substance, essence or divine nature-which alone is the principle of all things, besides which no other principle can be found. This reality neither begets nor is begotten nor proceeds; the Father begets, the Son is begotten and the holy Spirit proceeds.” (From Canon 2)
In this defining of Father, Son, and Spirit as one individual reality, semi-modalism is no different than classical Sabellianism. The Trinity itself is defined as a single supreme reality or being which is the principle of all things. If the Father, Son, and Spirit are all one rational individual Being (the very definition of a person), then the true distinct existence of the Son and Spirit as two other distinct rational Beings (that is, two distinct persons) in addition to the first is denied. The Son and Spirit are made to no longer be the Son of the one God and the Spirit of the one God, but mere “modes of subsistence” within him. The reality of both the Son and Spirit’s distinct existence from the Father is consumed into a single “supreme reality” which is all three. Rather than being worshipped as the Son of the Almighty, Christ is worshipped as the Almighty, as being, ultimately, the self-same person with the Father. Rather than being worshipped as the Son of the one God, the Son and Spirit are worshipped as themselves being the one God, as being one person with the Father.
As Samuel Clarke wrote:
“They who are not careful to maintain these personal characters and distinctions, but while they are solicitous (on the one hand) to avoid the errors of the Arians, affirm (in the contrary extreme) the Son and Holy Spirit to be (individually with the Father) the Self-existent Being: These, seeming in the Words to magnify the Name of the Son and Holy Spirit, in reality take away their very Existence; and so fall unawares into Sabellianism, (which is the same with Socinianism.)” (Scripture Doctrine of the Trinity, Thesis 23)
This is quite at odds with the ancient rule of faith, which everywhere treats the Son and Spirit as truly distinct persons besides the Father. The Son in being Son, must necessarily be a distinct person; likewise, in being our “one Lord” He most clearly is a person, for a Lord is a person who possess lordship. The rule of faith, likewise, in teaching that the Spirit spoke through the prophets and was sent by the Son unto believers, teaches His existence as a third distinct person. Semi-modalism’s denial, then, of the distinct personal existence of the Son and Spirit, constitutes a clear denial of the second and third articles of the rule of faith.
Finally, let us examine our fourth point, related to the last, that semi-modalism denies the second article of the faith by denying that Christ is the Son of the one God. This is quite simple; if Christ is merely a person of the one God, a mere mode of subsistence of the one God, the Trinity conceived of as a person, as semi-modalism makes Him out to be, then He is not Himself the Son of the one God. For a Son, anyone will admit, is a distinct person from the person whose Son they are. They must be another besides the one whose Son they are, who relates to that person as a Father. If Christ is a mere subsistence of the one God, as semi-modalism says, then He relates to the one God as a mode of His subsistence, not as His Son; He is not begotten of Him, but rather is Him. On the other hand, if He were the Son of the one God, as the rule of faith says, then He must be another distinct individual being besides the one God, begotten from Him. He will no longer then be considered a mode of subsistence of the one God, but His Son. In short, Christ can either be the Son of the one God, or a mode of subsistence of one God, a person of God. The rule of faith teaches the former, semi-modalism the latter; their teachings are mutually exclusive.
In the end, then, we are forced to the conclusion that semi-modalism constitutes a rejection of the rule of faith; in total, it denies all three articles, and strikes at the very heart of what the rule of faith sets out to clearly confess: the identities of the Father, the Son, and the Holy Spirit. While the rule of faith, with scripture, says that the Father is the one God, the Almighty, Ruler over all, semi-modalism denies this, assigning these prerogatives to another person neither mentioned in the rule of faith nor scripture, “God the Trinity”, “the triune God”, the Trinity conceived of as a person, a god every bit as fictitious as those of Marcion and the gnostics of old, against which the same rule of faith was asserted to convict them of heresy. Likewise, while scripture and the rule of faith teach us to believe in the Son and Holy Spirit as two distinct persons in addition to the one God, semi-modalism ultimately denies the very existence of the Son and Spirit along with Sabellius and Praxeas of old, by making them out to be one and the same individual reality or being with the Father. Finally, while the rule of faith, like scripture, declares Jesus Christ to be the Son of the one God, semi-modalism denies this by making Him out to be nothing more than a subsistence or ‘person’ of the one God, denying that the Son relates to the one God as a Son.
To anyone willing to look at these matters objectively, it should be clear that semi-modalism blatantly contradicts the rule of faith at several points. That those who expound semi-modalism do not admit the contradiction between their heresy and the rule of faith should be of no surprise, and does nothing to lessen the real contradiction between these two opposing systems of doctrine. Arians too, we may recall, would not admit to violating the rule of faith with their heresy either; but sought to cunningly evade detection by means of equivocation. So semi-modalists do the same, yet, as in the case of the Arians, in truth it is inescapable that their doctrine contradicts the rule of faith, when their beliefs are brought out into the open.
In the end, one must choose between that ancient faith handed down once for all, as taught by the scriptures and preserved by the early church in the rule of faith, and semi-modalism. By the standards of that ancient rule, semi-modalism is every bit as much heresy as Sabellianism and Gnosticism; in its elaborate speculative denials of the first article of the faith, it bears a strong resemblance to gnosticism indeed; one might say semi-modalism is the new gnosticism. And like gnosticism of old, Christians will do well to shun it as the heresy it is, and instead hold fast to that apostolic rule of faith, that ancient and scriptural safeguard against heresy.