Glossary
4-12SENSATIONALISM (Leo)
[30] Critical idealism can refute naïve realism only by itself assuming, in naïve-realistic fashion, that one's own organism has objective existence. As soon as the idealist realizes that the percepts connected with his own organism are exactly of the same nature as those which naïve realism assumes to have objective existence, he can no longer use those percepts as a safe foundation for his theory. He would have to regard even his own subjective organization as a mere complex of mental pictures. But this removes the possibility of regarding the content of the perceived world as a product of our spiritual organization. One would have to assume that the mental picture "color" was only a modification of the mental picture "eye". So-called critical idealism cannot be proved without borrowing from naïve realism. Naive realism can be refuted only if, in another sphere, its own assumptions are accepted without proof as being valid.
[31] This much, then, is certain: Investigation within the world of percepts cannot establish critical idealism, and consequently, cannot strip percepts of their objective character.
[32] Still less can the principle "the perceived world is my mental picture" be claimed as obvious and needing no proof. Schopenhauer begins his chief work with the words:
The world is my mental picture -- this is a truth which holds good for everything that lives and cognizes, though man alone can bring it into reflective and abstract consciousness. If he really does this, he has attained to philosophical discretion. It then becomes clear and certain to him that he knows no sun and no earth, but only an eye that sees a sun, a hand that feels an earth; that the world which surrounds him is there only as mental picture, that is, only in relation to something else, to the one who pictures it, which is he himself. If any truth can be asserted a priori, it is this one, for it is the expression of that form of all possible and thinkable experience which is more universal than all others, than time, space, or causality, for all these presuppose it . This whole theory is wrecked by the fact, already mentioned, that the eye and the hand are percepts no less than the sun and the earth. Using Schopenhauer's expressions in his own sense, we could reply: My eye that sees the sun, my hand that feels the earth, are my mental pictures just as much as the sun and the earth themselves. That with this the whole theory cancels itself, is clear without further argument. For only my real eye and my real hand could have the mental pictures "sun" and "earth" as modifications of themselves; the mental pictures "eye" and "hand" cannot have them. Yet it is only of these mental pictures that critical idealism is allowed to speak.
[33] Critical idealism is totally unfitted to form an opinion about the relationship between percept and mental picture. It cannot begin to make the distinction, mentioned above, between what happens to the percept in the process of perception and what must be inherent in it prior to perception. We must, therefore, tackle this problem in another way.
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