It often happens in philosophy that the half-truth takes its place beside the whole truth and assumes on its own account the position of something permanent. But the fact is that the half-truth, instead of being a fixed or self-subsistent principle, is a mere element absolved and included in the whole. The metaphysic of understanding is dogmatic, because it maintains half-truths in their isolation: whereas the idealism of speculative philosophy carries out the principle of totality and shows that it can reach beyond the inadequate formularies of abstract thought. Thus idealism would say:—The soul is neither finite only, nor infinite only; it is really the one just as much as the other, and in that way neither the one nor the other. In other words; such formularies in their isolation are inadmissible, and only come into account as formative elements in a larger notion. Such idealism we see even in the ordinary phases of consciousness. Thus we say of sensible things, that they are changeable: that is, they are, but it is equally true that they are not. We show more obstinacy in dealing with the categories of the understanding. These are terms which we believe to be somewhat firmer—or even absolutely firm and fast. We look upon them as separated from each other by an infinite chasm, so that opposite categories can never get at each other. The battle of reason is the struggle to break up the rigidity to which the understanding has reduced everything.
33.] The first part of this metaphysic in its systematic form is Ontology, or the doctrine of the abstract characteristics of Being. The multitude of these characteristics, and the limits set to their applicability, are not founded upon any principle. They have in consequence to be enumerated as experience and circumstances direct, and the import ascribed to them is founded only upon common sensualised conceptions, upon assertions that particular words are used in a particular sense, and even perhaps upon etymology. If experience pronounces the list to be complete, and if the usage of language, by its agreement, shows the analysis to be correct, the metaphysician is satisfied; and the intrinsic and independent truth and necessity of such characteristics is never made a matter of investigation at all.
To ask if being, existence, finitude, simplicity, complexity, &c. are notions intrinsically and independently true, must surprise those who believe that a question about truth can only concern propositions (as to whether a notion is or is not with truth to be attributed, as the phrase is, to a subject), and that falsehood lies in the contradiction existing between the subject in our ideas, and the notion to be predicated of it. Now as the notion is concrete, it and every character of it in general is essentially a self-contained unity of distinct characteristics. If truth then were nothing more than the absence of contradiction, it would be first of all necessary in the case of every-notion to examine whether it, taken individually, did not contain this sort of intrinsic contradiction.
34.] The second branch of the metaphysical system was Rational Psychology or Pneumatology. It dealt with the metaphysical nature of the Soul,—that is, of the Mind regarded as a thing. It expected to find immortality in a sphere dominated by the laws of composition, time, qualitative change, and quantitative increase or decrease.
The name 'rational,' given to this species of psychology, served to contrast it with empirical modes of observing the phenomena of the soul. Rational psychology viewed the soul in its metaphysical nature, and through the categories supplied by abstract thought. The rationalists endeavoured to ascertain the inner nature of the soul as it is in itself and as it is for thought.—In philosophy at present we hear little of the soul: the favourite term now is mind (spirit). The two are distinct, soul being as it were the middle term between body and spirit, or the bond between the two. The mind, as soul, is immersed in corporeity, and the soul is the animating principle of the body.
The pre-Kantian metaphysic, we say, viewed the soul as a thing. 'Thing' is a very ambiguous word. By a thing, we mean, firstly, an immediate existence, something we represent in sensuous form: and in this meaning the term has been applied to the soul. Hence the question regarding the seat of the soul. Of course, if the soul have a seat, it is in space and sensuously envisaged. So, too, if the soul be viewed as a thing, we can ask whether the soul is simple or composite. The question is important as bearing on the immortality of the soul, which is supposed to depend on the absence of composition. But the fact is, that in abstract simplicity we have a category, which as little corresponds to the nature of the soul, as that of compositeness.
One word on the relation of rational to empirical psychology. The former, because it sets itself to apply thought to cognise mind and even to demonstrate the result of such thinking, is the higher; whereas empirical psychology starts from perception, and only recounts and describes what perception supplies. But if we propose to think the mind, we must not be quite so shy of its special phenomena. Mind is essentially active in the same sense as the Schoolmen said that God is 'absolute actuosity.' But if the mind is active it must as it were utter itself. It is wrong therefore to take the mind for a processless ens, as did the old metaphysic which divided the processless inward life of the mind from its outward life. The mind, of all things, must be looked at in its concrete actuality, in its energy; and in such a way that its manifestations are seen to be determined by its inward force.
35.] The third branch of metaphysics was Cosmology. The topics it embraced were the world, its contingency, necessity, eternity, limitation in time and space: the laws (only formal) of its changes: the freedom of man and the origin of evil.
To these topics it applied what were believed to be thorough-going contrasts: such as contingency and necessity; external and internal necessity; efficient and final cause, or causality in general and design; essence or substance and phenomenon; form and matter; freedom and necessity; happiness and pain; good and evil.
The object of Cosmology comprised not merely Nature, but Mind too, in its external complication in its phenomenon—in fact, existence in general, or the sum of finite things. This object however it viewed not as a concrete whole, but only under certain abstract points of view. Thus the questions Cosmology attempted to solve were such as these: Is accident or necessity dominant in the world? Is the world eternal or created? It was therefore a chief concern of this study to lay down what were called general Cosmological laws: for instance, that Nature does not act by fits and starts. And by fits and starts (saltus) they meant a qualitative difference or qualitative alteration showing itself without any antecedent determining mean: whereas, on the contrary, a gradual change (of quantity) is obviously not without intermediation.