Immanuel Kant's Critique of Pure Reason — trans. F. Max Müller
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they are in themselves, remain always unknown to us, for a difference of the things themselves. No doubt I, as represented by the internal sense in time, and objects in space outside me, are two specifically different phenomena, but they are not therefore conceived as different things. The transcendental object, which forms the foundation of external phenomena, and the other, which forms the foundation of our internal intuition, is therefore [p. 380] neither matter, nor a thinking being by itself, but simply an unknown cause of phenomena which supply to us the empirical concept of both.
If therefore, as evidently forced to do by this very criticism, we remain faithful to the old rule, never to push questions beyond where possible experience can supply us with an object, we shall never dream of going beyond the objects of our senses and asking what they may be by themselves, that is, without any reference to our senses. But if the psychologist likes to take phenomena for things by themselves, then, whether he admit into his system, as a materialist, matter only, or, as a spiritualist, thinking beings only (according to the form of our own internal sense), or, as a dualist, both, as things existing in themselves, he will always be driven by his mistake to invent theories as to how that which is not a thing by itself, but a phenomenon only, could exist by itself.
CONSIDERATION [p. 381]
on the Whole of Pure Psychology, as affected by these
Paralogisms
L If we compare the science of the soul, as the physiology of the internal sense, with the science of the body, as a physiology of the objects of external senses, we find,
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besides many things which in both must be known empirically, this important difference, that in the latter many things can be known a priori from the mere concept of an extended and impermeable being, while in the former nothing can be known a priori and synthetically from the concept of a thinking being. The cause is this. Though both are phenomena, yet the phenomena of the external sensa have something permanent, which suggests a substratum of varying determinations, and consequently a synthetical concept, namely, that of space, and of a phenomenon in space ; while time, the only form of our internal intuition, has nothing permanent, and makes us to know the change of determinations only, but not the determinable object. For in what we call soul there is a continuous flux, and nothing permanent, except it may be (if people will so have it) the simple /, so simple because this representation has no contents, consequently nothing manifold, so that it seems to represent, or more accurately to indicate, a simple [p. 382] object. This I or Ego would have to be an intuition, which, being presupposed in all thought (before all experience), might as an intuition a priori supply synthetical propositions, if it should be possible to get any knowledge by pure reason of the nature of a thinking being in general. But this I is neither an intuition nor a concept of any object, but the mere form of consciousness which can accompany both classes of representations, and impart to them the character of knowledge, provided something else be given in intuition which supplies matter for a representation of an object. Thus we see that the whole of rational psychology is impossible as transcending the powers of human reason, and
3IO Transcendental Dialectic nothing remains to us but to study our soul under the guidance of experience, and to keep ourselves within the limits of questions which do not go beyond the line where the material can be supplied by possible internal experience.
But although rational psychology is of no use in extending our knowledge, but as such is made up of paralogisms only, we cannot deny to it an important negative utility, if it does not pretend to be more than a critical investigation of our dialectical syllogisms, as framed by our common and natural reason.
What purpose can be served by psychology [p. 383] founded on pure principles of reason } Its chief purpose is meant to be to guard our thinking self against the danger of materialism. This purpose however is answered, as we have shown, by the concept which reason gives of our thinking self. For, so far from there being any fear lest, if matter be taken away, all thought, and even the existence of thinking beings might vanish, it has been on the contrary clearly shown that, if we take away the thinking subject, the whole material world would vanish, because it is nothing but a phenomenon in the sensibility of our own subject, and a certain class of its representations.
It is true that I do not know thus this thinking self any better according to its qualities, nor can I perceive its permanence, or even the independence of its existence from the problematical transcendental substratum of external phenomena, both being necessarily unknown to us. But as it is nevertheless possible that I may find reason, from other than purely speculative causes, to hope for an independent, and, during every possible
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