Page:The World as Will and Idea - Schopenhauer, tr. Haldane and Kemp - Volume 3.djvu/498

of the will is therefore an absurdity, as is also Kant's "Practical Reason." These, results are followed by an examination of the nature of vision, which Schopenhauer sums up in these words: "I have examined all these visual processes in detail in order to show that the understanding is active in all of them, the understanding which, by apprehending every change as an effect and referring it to its cause, creates on the basis of the a priori and fundamental intuitions or perceptions of space and time, the objective world, that phenomenon of the brain, for which the sensations of the senses afford only certain data. And this task the understanding accomplishes only through its proper form, the law of causality, and accomplishes it directly without the aid of reflection, that is, of abstract knowledge through concepts and words, which are the material of secondary knowledge, of thought, thus of the Reason." "What understanding knows aright is reality; what reason knows aright is truth, i.e., a judgment which has a ground; the opposite of the former being illusion (what is falsely perceived), of the latter error (what is falsely thought)." All understanding is an immediate apprehension of the causal relation, and this is the sole function of understanding, and not the complicated working of the twelve Kantian Categories, the theory of which is a mistaken one. A consequence of this conclusion is, that arithmetical processes do not belong to the understanding, concerned as they are with abstract conceptions. But it must not be forgotten that between volition and the apparently consequential action of the body there is no causal relation, for they are the same thing perceived in two different ways. Section 23 contains a detailed refutation of Kant's proof of the a priori nature of the causal relation in the "Second Analogy of Experience" of the Critique of Pure Reason, the gist of the objection being that the so-called subjective succession is as much objective in reality as what is called objective by Kant: "Phenomena may well follow one another, without following from one another."