KANT'S OPINION OF THE ARGUMENTS PROVING THE SUBSTANTIALITY OF THE SOUL.
51. The psychological arguments in favor of the substantiality of the soul are mere paralogisms, in Kant's opinion; although they prove an ideal substance, they can never lead to a real substance. Besides the arguments with which this philosopher attacks the psychological proof of the substantiality of the soul, he had also a personal argument, which, considering the weakness of the human heart, was very powerful. He had either to place the substantiality of the soul in doubt, or else consent to the ruin of his whole system. "It would be," he says, "a great and even the only stumbling-block in our whole critique, if there were a possibility of demonstrating a priori that all thinking beings are in themselves simple substances, and (which is a consequence of the principle of this demonstration) are inseparably accompanied by personality and the consciousness of their existence distinct from all matter. For, in this case, if we had taken a single step out of the world of the senses, we should have entered into the field of the noumena, and no one would dispute our right to extend farther into it, to build in it, and, according to each one's good luck, to take possession of it."[43]
52. In Kant's conception, the first paralogism of pure psychology in favor of the substantiality of the soul is the following:—"Every thing, the representation of which is the absolute substance of our judgments, and which cannot serve as a determination of any thing else, is a substance. The me, as thinking being, is the absolute substance of all possible judgments, and this representation of itself cannot be the predicate of any thing else; therefore the me, as thinking being, is a substance."
These are the terms in which he presents the psychological reasoning which he proposes to attack, in the first edition of his Critic of Pure Reason; in the second edition, wishing to be more clear, or, perhaps, more obscure, he expresses the same argument in these words:—"That which cannot be thought otherwise than as subject, does not exist otherwise than as subject, and is therefore substance. Now a thinking being, regarded merely as such, cannot be thought otherwise than as subject. Therefore it exists only as such, that is, as substance." We must confess that if psychology could find no clearer expounders than Kant, and should have to use in its demonstrations the forms which this philosopher employs in these passages, it would have but a small number of proselytes, for the simple reason that very few could understand its language. I am sure that but few readers would be convinced by the syllogisms proving the substantiality of the soul, such as Kant presents them; in this way there is a great advantage in the position of the philosopher; for he has to prove that an argument, the force of which has not been felt, has no force. But let us suppose the philosopher to descend from the Olympus of incomprehensible abstractions, and deign to use the humble language of mortals, presenting the psychological argument under a more simple form, who knows but what the conviction which it would produce would be somewhat more difficult to destroy? Let us see.
53. A substance is a being remaining identical with itself, a permanent reality in which different modifications occur. But there is within me this reality which, remaining identical, has a variety of thoughts, acts of the will, sentiments, and sensations, as is revealed by consciousness. Therefore that which is within me is a substance.
I defy all the philosophers in the world to point out a false, or even a doubtful proposition in this syllogism, or to show a fault in the consequence, without placing themselves in open contradiction with the testimony of consciousness on the one hand, and with all the laws of human reason on the other.
54. Kant pretends that the argument in favor of the substantiality of the soul is not conclusive, because the pure categories, and consequently that of substance also, have absolutely no objective value, except in so far as applied to the diversity of an intuition subject to them: that is to say, the conception of substance is a purely logical function, without any objective value or meaning except as referred to sensible things, and as soon as we leave the sphere of sensibility, it can lead to no result. It is evident that the substantiality of the soul cannot be the object of sensible intuition; consequently, to apply to the soul the idea of substance is to extend the conception beyond what its nature allows. It must be confessed that Kant's reasoning is conclusive, if we admit his principles; and here we have a proof of the necessity of combating certain theories, which, because they are in the realm of abstractions, seem innocent, but in reality are most dangerous, on account of the results to which they lead. Such is the system of Kant as denying the objective value of the pure categories, and this is why I have combated it,[44] demonstrating: I. That indeterminate conceptions, and the general principles founded on them, have an objective value beyond the field of sensible experience, in respect to beings which are in nowise subject to our intuition; II. That it is not true that we have only sensible intuition, for we have intuitive knowledge of a pure intellectual order, above the sphere of sensibility. This doctrine overthrows the whole of Kant's argument, for it destroys its foundation.
55. The German philosopher seems to have perceived the weak point in his reasoning, and therefore he tries to give the psychological argument in such terms as to show a transition from the ideal order to the real, keeping out of sight the point which unites things so distant. His language is purely ideological: "Every thing, the representation of which is the absolute substance of our judgments, and which cannot serve as a determination of any thing else, is a substance." Observe that he defines substance by the representation and the incapacity of serving as a determination of any thing else; that is, by purely ideological or dialectic attributes. The form which he employs in the second edition suffers from the same defect. "That which cannot be thought otherwise than as subject, does not exist otherwise than as subject, and is, therefore, substance." Why does he not tell us that the substance here spoken of is a permanent being, in which the modifications are realized, but which remains identical with itself? Why does he speak only of representation, of thought, of the determination or predicate? Because it helped his purpose to present the argument as a sophism in which there is a transition from one order to another entirely different order; because it was for his interest to give an obscure form, so that he could make the following observations:—"In the major, a being is spoken of which can be thought under any view in general, and consequently, also, as it is given in the intuition. But, in the minor, the same being is spoken of in so far as it is regarded as subject, in relation only to thought and the unity of consciousness, but not at the same time in relation to the intuition by which the unity is given to the thought as its object. Consequently the conclusion follows only by a fallacy, per sophisma figuræ dictionis." And in a note he says: "Thought is taken in the two premises in an entirely different sense; in the major, as belonging to an object in general, and such, consequently, as it may be given in the intuition; but in the minor only as it is in relation to the consciousness of self, where it is not thought in any object, but is merely represented in relation to itself, as subject, as the form of the thought. In the first case, a thing is spoken of which can only be thought as subject; but, in the second, thought is spoken of, not things, since abstraction is made of all objects; and in the thought the me always serves as subject of the consciousness; hence the conclusion which follows is not, that I cannot exist otherwise than as subject, but only, that I cannot make use of myself in the thought of my existence, otherwise than as subject of the judgment, which is an identical proposition, revealing absolutely nothing concerning the manner of my existence.[45] It makes one indignant to see a man attempt, by such a confusion of ideas and of words, to rob the human mind of its existence; for it amounts to the same thing, to deny that it is a substance. It makes one indignant to see a philosopher pretend, by such an absurd confusion, to attack one of the clearest, most evident, and most irresistible arguments which can be presented to human reason. I thought yesterday, I think to-day: in all the variety of my situations, I find myself the same and not another; this reality, which remains identical in the midst of diversity, I call my soul; therefore my soul is a permanent reality, the subject of modifications; therefore it is a substance. Can any thing be clearer?"
56. Psychology does, it is true, make use of the general idea of substance in proving the substantiality of the soul: but it appeals to a fact of experience, to the testimony of consciousness, in order to apply this idea to the present case. What does Kant mean when he pretends to have demonstrated that the conception of a thing which can exist of itself as subject, but not as mere attribute, does not involve any objective reality? When he speaks of subject, does he mean a real subject, the subject of modifications? Then the soul is a subject; but we do not say that it is a subject only; we conceive its reality under this aspect without, therefore, denying that it has other characters: on the contrary, we expressly acknowledge that it is an active principle, which implies something more that the mere subject of modifications, for this last is a passive, rather than an active, quality. If by subject Kant understands the logical subject, we deny that this is exclusively the character of the soul in such a way that it cannot logically be the attribute or predicate of a proposition.
57. "The conception of a thing," says Kant, "which can exist as its own subject, but not as a mere predicate, draws with it no objective reality; that is, one cannot know whether any object corresponds to it, since one cannot conceive the possibility of such a manner of existing, consequently there is absolutely no cognition. In order that it may indicate under the denomination of substance, an object which may be given, in order that it may be a cognition, a constant intuition must be placed at the foundation, as the indispensable condition of the objective reality of a conception, namely, that by which alone the object is given. But we have nothing constant in the internal intuition, for the me is only the consciousness of my thought; if, therefore, we confine ourselves to the thought alone, the necessary condition of the application of the conception of substance, that is, of a subject subsisting in itself as thinking being."[46]