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One has to glance at the opponents of the Eleates, in order to appreciate the extraordinary advantages in the assumption of Parmenides. What embarrassments,—from which Parmenides had escaped,—awaited Anaxagoras and all who believed in a plurality of substances, with the question, How many substances? Anaxagoras made the leap, closed his eyes and said, "Infinitely many"; thus he had flown at least beyond the incredibly laborious proof of a definite number of elementary substances. Since these "Infinitely Many" had to exist without increase and unaltered for eternities, in that assumption was given the contradiction of an infinity to be conceived as completed and perfect. In short, Plurality, Motion, Infinity driven into flight by Parmenides with the amazing proposition of the one "Being," returned from their exile and hurled their projectiles at the opponents of Parmenides, causing them wounds for which there is no cure. Obviously those opponents have no real consciousness and knowledge as to the awful force of those Eleatean thoughts, "There can be no time, no motion, no space; for all these we can only think of as infinite, and to be more explicit, firstly infinitely large, then infinitely divisible; but everything infinite has no 'Being,' does not exist," and this nobody doubts, who takes the meaning of the word "Being" severely and considers the existence of something contradictory impossible, e.g., the existence of a completed infinity. If however the very Actuality shows us everything under the form of the completed infinity then it becomes evident that it contradicts itself and therefore has no true reality. If those opponents however should object: "but in your thinking itself there does exist succession, therefore neither could your thinking be real and consequently could not prove anything," then Parmenides perhaps like Kant in a similar case of an equal objection would have answered: "I can, it is true, say my conceptions follow upon one another, but that means only that we are not conscious of them unless within a chronological order, i.e., according to the form of the inner sense. For that reason time is not a something in itself nor any order or quality objectively adherent to things." We should therefore have to distinguish between the Pure Thinking, that would be timeless like the one Parmenidean "Being," and the consciousness of this thinking, and the latter would already translate the thinking into the form of appearance, i.e., of succession, plurality and motion. It is probable that Parmenides would have availed himself of this loophole; however, the same objection would then have to be raised against him which is raised against Kant by A. Spir ("Thinking And Reality," 2nd ed., vol. i., pp. 209, &c). "Now, in the first place however it is clear, that I cannot know anything of a succession as such, unless I have the successive members of the same simultaneously in my consciousness. Thus the conception of a succession itself is not at all successive, hence also quite different from the succession of our conceptions. Secondly Kant's assumption implies such obvious absurdities that one is surprised that he could leave them unnoticed. Cæsar and Socrates according to this assumption are not really dead, they still live exactly as they did two thousand years ago and only seem to be dead, as a consequence of an organisation of my inner sense." Future men already live and if they do not now step forward as living that organisation of the "inner sense" is likewise the cause of it. Here above all other things the question is to be put: How can the beginning and the end of conscious life itself, together with all its internal and external senses, exist merely in the conception of the inner sense? The fact is indeed this, that one certainly cannot deny the reality of Change. If it is thrown out through the window it slips in again through the keyhole. If one says: "It merely seems to me, that conditions and conceptions change,"—then this very semblance and appearance itself is something objectively existing and within it without doubt the succession has objective reality, some things in it really do succeed one another.—Besides one must observe that indeed the whole critique of reason only has cause and right of existence under the assumption that to us our conceptions themselves appear exactly as they are. For if the conceptions also appeared to us otherwise than they really are, then one would not be able to advance any solid proposition about them, and therefore would not be able to accomplish any gnosiology or any "transcendental" investigation of objective validity. Now it remains however beyond all doubt that our conceptions themselves appear to us as successive."
The contemplation of this undoubted succession and agitation has now urged Anaxagoras to a memorable hypothesis. Obviously the conceptions themselves moved themselves, were not pushed and had no cause of motion outside themselves. Therefore he said to himself, there exists a something which bears in itself the origin and the commencement of motion; secondly, however, he notices that this conception was moving not only itself but also something quite different, the body. He discovers therefore, in the most immediate experience an effect of conceptions upon expansive matter, which makes itself known as motion in the latter. That was to him a fact; and only incidentally it stimulated him to explain this fact. Let it suffice that he had a regulative schema for the motion in the world,—this motion he now understood either as a motion of the true isolated essences through the Conceptual Principle, the Nous, or as a motion through a something already moved. That with his fundamental assumption the latter kind, the mechanical transmission of motions and impacts likewise contained in itself a problem, probably escaped him; the commonness and every-day occurrence of the effect through impact most probably dulled his eye to the mysteriousness of impact. On the other hand he certainly felt the problematic, even contradictory nature of an effect of conceptions upon substances existing in themselves and he also tried therefore to trace this effect back to a mechanical push and impact which were considered by him as quite comprehensible. For the Nous too was without doubt such a substance existing in itself and was characterised by him as a very delicate and subtle matter, with the specific quality of thinking. With a character assumed in this way, the effect of this matter upon other matter had of course to be of exactly the same kind as that which another substance exercises upon a third, i.e., a mechanical effect, moving by pressure and impact. Still the philosopher had now a substance which moves itself and other things, a substance of which the motion did not come from outside and depended on no one else: whereas it seemed almost a matter of indifference how this automobilism was to be conceived of, perhaps similar to that pushing themselves hither and thither of very fragile and small globules of quicksilver. Among all questions which concern motion there is none more troublesome than the question as to the beginning of motion. For if one may be allowed to conceive of all remaining motions as effect and consequences, then nevertheless the first primal motion is still to be explained; for the mechanical motions, the first link of the chain certainly cannot lie in a mechanical motion, since that would be as good as recurring to the nonsensical idea of the causa sui. But likewise it is not feasible to attribute to the eternal, unconditional things a motion of their own, as it were from the beginning, as dowry of their existence. For motion cannot be conceived without a direction whither and whereupon, therefore only as relation and condition; but a thing is no longer "entitative-in-itself" and "unconditional," if according to its nature it refers necessarily to something existing outside of it. In this embarrassment Anaxagoras thought he had found an extraordinary help and salvation in that Nous, automobile and otherwise independent; the nature of that Nous being just obscure and veiled enough to produce the deception about it, that its assumption also involves that forbidden causa sui. To empiric observation it is even an established fact that Conception is not a causa sui but the effect of the brain, yea, it must appear to that observation as an odd eccentricity to separate the "mind," the product of the brain, from its causa and still to deem it existing after this severing. This Anaxagoras did; he forgot the brain, its marvellous design, the delicacy and intricacy of its convolutions and passages and he decreed the "Mind-In-Itself." This "Mind-In-Itself" alone among all substances had Free-will,—a grand discernment! This Mind was able at any odd time to begin with the motion of the things outside it; on the other hand for ages and ages it could occupy itself with itself—in short Anaxagoras was allowed to assume a first moment of motion in some primeval age, as the Chalaza of all so-called Becoming; i.e., of all Change, namely of all shifting and rearranging of the eternal substances and their particles, Although the Mind itself is eternal, it is in no way compelled to torment itself for eternities with the shifting about of grains of matter; and certainly there was a time and a state of those matters—it is quite indifferent whether that time was of long or short duration—during which the Nous had not acted upon them, during which they were still unmoved. That is the period of the Anaxagorean chaos.