Back on
10/22/13, a gent who posts under the name dguller, provided an argument
in the combox of the Aquinas
and the doctrine of the Trinity: introduction and resources thread which exposes what sure seems to me to be a
logical contradiction in the Trinitarian thought of Aquinas. In my own readings
of Aquinas, I too have detected, what appears to be,
difficulties/inconsistencies/problems, but dguller's presentation is
much more sophisticated than my own musings. In an attempt to bring students
and/or scholars of Aquinas' thought 'to-the-table', I am reposting dguller's
comment/s anew in this thread, without any alteration.
Here's an
argument that purports to demonstrate the inconsistency of Thomism and the
Trinity.
Let’s begin with some preliminaries.
Say that you have A and B, and that A and B are really distinct from one another. A and B would necessarily have some things in common, and some things not in common. You can call what A and B have in common, their “principle of commonality” (or P(C)), and you can call what A and B do not have in common, their “principle of distinction” (or P(D)).
Two points follow from this.
First, P(C) cannot be really identical to P(D). If P(C) were really identical to P(D), then it would follow that what A and B have in common is really identical to what A and B do not have in common, which is a logical contradiction. It would logically be the equivalent of saying that X = not-X, which is impossible. So, P(C) cannot be really identical to P(D).
Second, P(C) cannot account for the real distinction between A and B. Only P(D) can account for the real distinction between A and B. If there was only P(C) between A and B, then A and B would not be really distinct at all, but rather would be really identical. In other words, if A and B have everything in common, then A is identical to B. There must be something about A that differs from B in order for A and B, or vice versa, to be really distinct. That “something” is P(D). To reject this would mean that it is possible for A to be really distinct from B and yet A does not differ from B in any way, which is absurd.
Putting this all together, we have the following principle:
(P) A is really distinct from B if and only if (a) there is P(C) and P(D) between A and B, and (b) P(D) between A and B cannot be really identical to P(C) between A and B (i.e. P(C) = not-P(D)).
It should be noted that Aquinas himself endorses this principle. He writes: “In whatever multitude of things is to be found something common to all, it is necessary to seek out the principle of distinction” (ST 1.40.2), and he mentions this principle within the context of a discussion of the Trinity, meaning that it must be applicable to the Trinity itself.
So, let’s apply (P) to the Trinity, which is what Aquinas has already given us license to do.
We agree that the divine persons are really distinct from one another. It would follow, based upon (P), that (a) there must be a P(C) and a P(D) between the divine persons, and (b) P(C) cannot be really identical to P(D). Now, what would P(C) and P(D) be in this context?
Aquinas helpfully supplies us with an answer. He states that because “the persons agree in essence, it only remains to be said that the persons are distinguished from each other by the relations” (ST 1.40.2), specifically “by relation of origin” (ST 1.29.4). That means that the divine essence is P(C) and the divine relations are P(D). This is consistent with what Aquinas says elsewhere when he writes that “the relations themselves are not distinguished from each other so far as they are identified with the essence” (ST 1.39.1). In other words, the real distinction between the divine persons cannot be accounted for by the divine essence, because you cannot distinguish between the divine persons on the basis of what they have in common (i.e. the divine essence), but only upon what they do not have in common (i.e. the divine relations). Hence, on the basis of (P) it would necessarily follow that the divine relations (= P(D)) are not really identical to the divine essence (= P(C)).
Let’s begin with some preliminaries.
Say that you have A and B, and that A and B are really distinct from one another. A and B would necessarily have some things in common, and some things not in common. You can call what A and B have in common, their “principle of commonality” (or P(C)), and you can call what A and B do not have in common, their “principle of distinction” (or P(D)).
Two points follow from this.
First, P(C) cannot be really identical to P(D). If P(C) were really identical to P(D), then it would follow that what A and B have in common is really identical to what A and B do not have in common, which is a logical contradiction. It would logically be the equivalent of saying that X = not-X, which is impossible. So, P(C) cannot be really identical to P(D).
Second, P(C) cannot account for the real distinction between A and B. Only P(D) can account for the real distinction between A and B. If there was only P(C) between A and B, then A and B would not be really distinct at all, but rather would be really identical. In other words, if A and B have everything in common, then A is identical to B. There must be something about A that differs from B in order for A and B, or vice versa, to be really distinct. That “something” is P(D). To reject this would mean that it is possible for A to be really distinct from B and yet A does not differ from B in any way, which is absurd.
Putting this all together, we have the following principle:
(P) A is really distinct from B if and only if (a) there is P(C) and P(D) between A and B, and (b) P(D) between A and B cannot be really identical to P(C) between A and B (i.e. P(C) = not-P(D)).
It should be noted that Aquinas himself endorses this principle. He writes: “In whatever multitude of things is to be found something common to all, it is necessary to seek out the principle of distinction” (ST 1.40.2), and he mentions this principle within the context of a discussion of the Trinity, meaning that it must be applicable to the Trinity itself.
So, let’s apply (P) to the Trinity, which is what Aquinas has already given us license to do.
We agree that the divine persons are really distinct from one another. It would follow, based upon (P), that (a) there must be a P(C) and a P(D) between the divine persons, and (b) P(C) cannot be really identical to P(D). Now, what would P(C) and P(D) be in this context?
Aquinas helpfully supplies us with an answer. He states that because “the persons agree in essence, it only remains to be said that the persons are distinguished from each other by the relations” (ST 1.40.2), specifically “by relation of origin” (ST 1.29.4). That means that the divine essence is P(C) and the divine relations are P(D). This is consistent with what Aquinas says elsewhere when he writes that “the relations themselves are not distinguished from each other so far as they are identified with the essence” (ST 1.39.1). In other words, the real distinction between the divine persons cannot be accounted for by the divine essence, because you cannot distinguish between the divine persons on the basis of what they have in common (i.e. the divine essence), but only upon what they do not have in common (i.e. the divine relations). Hence, on the basis of (P) it would necessarily follow that the divine relations (= P(D)) are not really identical to the divine essence (= P(C)).
But then we reach three severe problems.
First, Aquinas has written that “a divine person signifies a relation as subsisting” (ST 1.29.4), and thus the divine persons are the divine subsistent relations. So, this account is fundamentally circular and tautological. Saying that the real distinction between the divine persons is due to the real distinction between the divine persons does not really explain anything at all.
Second, Aquinas has written that “relation really existing in God is really the same as His essence and only differs in its mode of intelligibility” and “in God relation and essence do not differ from each other, but are one and the same” (ST 1.28.2). So, we have a logical contradiction, because the divine essence cannot be really identical to the divine relations, according to (P), and the divine essence is really identical to the divine relations, according to the doctrine of the Trinity.
(Furthermore, to say that the distinction between the divine essence and the divine relations is “only … in its mode of intelligibility” (ST 1.28.2) and “differ in our way of thinking” (ST 1.39.1) just means that there is no difference in reality between the divine essence and the divine relations. The distinction between them is exclusively and only in our minds, and does not correspond to reality at all. It is like the distinction between goodness and being, which also “differ only in idea” and “differ in thought” (ST 1.5.1). And that means that a key element in the doctrine of the Trinity is nothing but a mental construct that does not correspond to anything in reality, which makes the Trinity a subjective truth of the human mind, and not an objective truth about reality. And that, in itself, undermines the truth of the Trinity.)
Third, Aquinas has written: “Everything which is not the divine essence is a creature” and “if it is not the divine essence, it is a creature” (ST 1.28.2). And this makes perfect sense, because, according to divine simplicity, the divine essence is Being Itself (ST 1.3.4), and only Being Itself does not depend upon anything else for its existence. Anything that is not Being Itself must depend upon something else for its existence, and anything that must depend upon something else for its existence is necessarily a creature. Thus, anything that is not Being Itself (i.e. the divine essence) is a creature. It would follow, therefore, that since the divine relations are not the divine essence, and everything that is not the divine essence is a creature, that the divine relations are creatures. Not only does this negate the Trinity, but it also has a number of absurd consequences, such as that the divine relations could not exist as cause until their effects first existed, that the divine relations must be composite entities, that the divine relations would exist in a relation of dependence upon creation, and so on.
In conclusion, if one endorses (P), and I do not see how one can coherently reject (P), and also endorses a number of other Trinitarian and Thomist principles, then one is led to a number of logical contradictions. Specifically, the following premises, when taken in conjunction, lead to inconsistency:
(1) A is really distinct from B if and only if (a) there is P(C) and P(D) between A and B, and (b) P(D) between A and B cannot be really identical to P(C) between A and B (i.e. P(C) = not-P(D))
(2) Everything that is not the divine essence is a creature
(3) The divine relations are really distinct from one another
(4) The divine relations share the divine essence in common
(5) The divine relations are really identical to the divine essence
One must reject, at least, one premise in order to avoid logical inconsistency. The question is which one.
Looking
forward to some charitable and spirited discussion...
Grace and
peace,