These substances, existing successively and transmitting their consciousness from one to another, would be something distinct from the act of consciousness, or they would not. If distinct, we must admit a subject of the consciousness, which in itself, and as subject, does not come under the sensible intuition; and consequently we may argue ad hominem, and retort Kant's objection against himself. If these transitory substances are only the act of the consciousness, when the act ceases, nothing remains of the substances, and therefore, there is nothing transmissible.

Transmission supposes something which may be transmitted; if, then, the act of consciousness is transmitted, it must be something permanent in itself, in the midst of the succession of the substances; and this is a very strange conclusion to which the German philosopher is brought by his theory of transmission. All psychologists had said that the substance of the soul is permanent, and its phenomena transitory; now, on the contrary, we find that the transitory is the substance, and that which is permanent is the phenomenon, or the act of consciousness which is transmitted.

66. Perhaps it may be answered that by transmission is not meant the communication of any thing constant, but merely the succession of phenomena united by any tie among themselves. Thus, supposing the instants A, B, C, D, the acts of consciousness, a, b, c, d, corresponding to them, will not be strictly identical in number, but successive, and connected. But this reply, which avoids the necessity of admitting the permanence of the act of consciousness, explains nothing, and makes it incomprehensible, how, at the instant D, for example, there can be consciousness of the acts c, b, a, which there is an irresistible inclination to believe have at bottom something numerically identical. When d exists there is no longer any thing of c left; there is no substance remaining, because, by the supposition there either is no such substance, or it is something transitory; there is no act of consciousness remaining, because a is numerically distinct from c, and besides, we have seen that the permanence of the phenomena cannot be admitted. Therefore it is absolutely impossible to explain or to comprehend how there can be in the act a the representation of c.

67. To say that the phenomena are united by any tie whatever is to elude the difficulty by a foolish play upon words. What is the meaning, in this case, of uniting, of a tie? They are metaphors which if they mean any thing must express the permanence of some thing amid the variety of the phenomena; the tie, the bond, must extend to the various things which it connects and unites: therefore it must be common to them all; and this something, whatever it be, which remains constant in variety, we call substance.

68. The mere succession of the phenomena or acts of consciousness is not sufficient to transmit the belief of the numerical identity; if it were, all men would be conscious of the previous acts of others. Let a, b, be two successive acts of consciousness: if, in order that the act b, which is numerically distinct from a, may represent the numerical identity of consciousness, it is sufficient that b should succeed a; since this succession is met with in the acts of consciousness of different men, it must follow that all men have consciousness of all the acts of the others. Risum tematis? And yet this conclusion is absolutely necessary: it cannot be avoided by saying that there is a form of the internal sense, and that the succession takes place in each man in his respective internal sense, and that therefore the succession of the internal phenomena of one is in a different time, in a different form from what it is in another. The words, respective internal sense, internal form of each man, have a meaning, if we admit something permanent in our interior; but if there is nothing but successive phenomena, the word respective is absurd, because there can be no respective internal sense if there is nothing to which it can refer. Suppose the man M, and the man N be merely a succession of phenomena, and in each one there is only a mere succession: there is the same reason why the phenomena of N should be connected with each other as with those of M. Therefore, if there is a community of consciousness in the phenomena of M, without any other sufficient reason than the mere succession, this community should be found in all the phenomena, because they all have the same sufficient reason.

69. It must be observed that in all this argument, I abstract the nature of the substance of the soul, and only purpose to demonstrate that we must admit something constant in the midst of the variety of the phenomena, and common to them all. Call it a tie, a form, an act of consciousness, or what you will, it is either something real or it is not. If it is not something real, whoever expresses it, employs a word without any meaning: if it is something real, the substantiality of the soul is acknowledged, because a permanent reality is admitted in the midst of the variety of the phenomena. We, who admit this substantiality, do not pretend that the soul can be given in sensible intuition, nor that we can express in an exact definition its internal properties abstracted from the phenomena which we experience in it. What we say is, that we know its real existence, its permanence, and its numerical identity in the midst of the succession and diversity of the phenomena. Therefore from the moment that it is admitted that there is within us something real, permanent, and numerically identical in the midst of diversity, the substantiality of the soul, which we defend, is admitted. Disputes may arise on the distinctive character of its nature; whether it is or is not a force, as Leibnitz maintained, whether its essence consists in thought, as was the opinion of Descartes: but these questions are foreign to the matter now in hand. Is there something real and permanent amid the variety of internal phenomena? If there is not, the consciousness of numerical identity is absurd; if there is, then the substantiality of the soul is demonstrated.

70. "The opinion of some ancient philosophers," says Kant, "that all is transitory and nothing constant in the world, although it cannot be maintained if we admit substances, still it cannot be refuted by the unity of consciousness; because we cannot even judge by consciousness, whether, as something, we are or are not permanent; for we attribute to our identical me only that of which we have consciousness, and thus we must necessarily judge that we are precisely the same in all the durations of which we are conscious." Kant expressly acknowledges that the judgment that we are the same is necessary, that is, that the identity of the me is for us a necessary fact of consciousness. It would be difficult to imagine a confession more injurious and more conclusive against the arguments of the German philosopher. If we are forced to judge ourselves identical, if consciousness tell us so, can we deny or doubt this identity without destroying the fundamental fact of all psychological investigations, and consequently falling into the most complete skepticism? If the testimony of consciousness is not valid, if the judgment to which it necessarily forces us is not certain, what shall we catch hold of in order that we may not be precipitated into the most absolute skepticism? where shall we look for a solid foundation for the edifice of our knowledge?

71. "But," Kant continues, "from the point of view of another, we cannot hold this judgment valid, because, finding in the soul no other constant phenomenon than the representation of the me which accompanies and unites all the other phenomena, we can never decide that this me (a simple thought) is not as fleeting as the other thoughts, which are respectively connected by it." Do not, then, admit that the representation of the me, although essentially representing an identity, is valid; say that, although transitory it necessarily brings us to the illusion of permanence; but draw also all the consequences of this doctrine, and maintain that human reason avails nothing, absolutely nothing; say that recollection is a pure illusion, that although we are necessarily induced to believe that the thought which we now have is the recollection of another previous thought, that all this is pure illusion; that we are not sure that there is the relation of recollection, and that we only know that at present we have the consciousness of a thought which seems to us connected with another previous thought; say too that reasoning has no validity, for all conviction of ideas is impossible without memory; and that, although an internal representation necessarily produces an assent, we must distrust the judgment which necessity demands: say too that all that we think, all that we perceive, all that we will, all that we experience within us, cannot enable us to know any thing, that we are condemned to a complete impotence of acquiring any certainty of any thing; and that the language of every philosopher should be the following: "This now seems so; I am conscious of it; I know nothing further; I experience a necessity of believing it, but perhaps this belief is a pure illusion; I know nothing of the external world; I know nothing either of the internal world; all knowledge is denied me; I myself am only a succession of phenomena which pass away and disappear; an irresistible necessity impels me to believe that these phenomena have a common tie, but this tie is nothing; because when a phenomenon disappears nothing is before it; if I acknowledge any reality, no matter what, I fall into the substantiality of the soul, which I have resolved not to admit; all is illusion, all is nothing, because, as I am not even certain of the facts of consciousness, I am not certain even of the illusion." Who can encounter such consequences?