Balmes—and with him the a priori spiritualists who seek to rationalize faith in the immortality of the soul—ignore the only rational explanation, which is that apperception and judgement are a resultant, that perceptions or ideas themselves are components which agree. They begin by supposing something external to and distinct from the states of consciousness, something that is not the living body which supports these states, something that is not I but is within me.
The soul is simple, others say, because it reflects upon itself as a complete whole. No; the state of consciousness A, in which I think of my previous state of consciousness B, is not the same as its predecessor. Or if I think of my soul, I think of an idea distinct from the act by which I think of it. To think that one thinks and nothing more, is not to think.
The soul is the principle of life, it is said. Yes; and similarly the category of force or energy has been conceived as the principle of movement. But these are concepts, not phenomena, not external realities. Does the principle of movement move? And only that which moves has external reality. Does the principle of life live? Hume was right when he said that he never encountered this idea of himself—that he only observed himself desiring or performing or feeling something.[27] The idea of some individual thing—of this inkstand in front of me, of that horse standing at my gate, of these two and not of any other individuals of the same class—is the fact, the phenomenon itself. The idea of myself is myself.
All the efforts to substantiate consciousness, making it independent of extension—remember that Descartes opposed thought to extension—are but sophistical subtilties intended to establish the rationality of faith in the immortality of the soul. It is sought to give the value of objective reality to that which does not possess it—to that whose reality exists only in thought. And the immortality that we crave is a phenomenal immortality—it is the continuation of this present life.
The unity of consciousness is for scientific psychology—the only rational psychology—simply a phenomenal unity. No one can say what a substantial unity is. And, what is more, no one can say what a substance is. For the notion of substance is a non-phenomenal category. It is a noumenon and belongs properly to the unknowable—that is to say, according to the sense in which it is understood. But in its transcendental sense it is something really unknowable and strictly irrational. It is precisely this concept of substance that an unforewarned mind reduces to a use that is very far from that pragmatic application to which William James referred.
And this application is not saved by understanding it in an idealistic sense, according to the Berkeleyan principle that to be is to be perceived (esse est percipi). To say that everything is idea or that everything is spirit, is the same as saying that everything is matter or that everything is energy, for if everything is idea or everything spirit, and if, therefore, this diamond is idea or spirit, just as my consciousness is, it is not plain why the diamond should not endure for ever, if my consciousness, because it is idea or spirit, endures for ever.
George Berkeley, Anglican Bishop of Cloyne and brother in spirit to the Anglican bishop Joseph Butler, was equally as anxious to save the belief in the immortality of the soul. In the first words of the Preface to his Treatise concerning the Principles of Human Knowledge, he tells us that he considers that this treatise will be useful, "particularly to those who are tainted with scepticism, or want a demonstration of the existence and immateriality of God, or the natural immortality of the soul." In paragraph cxl. he lays it down that we have an idea, or rather a notion, of spirit, and that we know other spirits by means of our own, from which follows—so in the next paragraph he roundly affirms—the natural immortality of the soul. And here he enters upon a series of confusions arising from the ambiguity with which he invests the term notion. And after having established the immortality of the soul, almost as it were per saltum, on the ground that the soul is not passive like the body, he proceeds to tell us in paragraph cxlvii. that the existence of God is more evident than that of man. And yet, in spite of this, there are still some who are doubtful!
The question was complicated by making consciousness a property of the soul, consciousness being something more than soul—that is to say, a substantial form of the body, the originator of all the organic functions of the body. The soul not only thinks, feels, and wills, but moves the body and prompts its vital functions; in the human soul are united the vegetative, animal, and rational functions. Such is the theory. But the soul separated from the body can have neither vegetative nor animal functions.
A theory, in short, which for the reason is a veritable contexture of confusions.
After the Renaissance and the restoration of purely rational thought, emancipated from all theology, the doctrine of the mortality of the soul was re-established by the newly published writings of the second-century philosopher Alexander of Aphrodisias and by Pietro Pomponazzi and others. And in point of fact, little or nothing can be added to what Pomponazzi has written in his Tractatus de immortalitate animæ. It is reason itself, and it serves nothing to reiterate his arguments.