Metaphysical Explanations. – The young man values metaphysical explanations, because they show him something highly significant in things which he found unpleasant or despicable, and if he is dissatisfied with himself, the feeling becomes lighter when he recognises the innermost world-puzzle or world-misery in that which he so strongly disapproves of in himself. To feel himself less responsible and at the same time to find things more interesting – that seems to him a double benefit for which he has to thank metaphysics. Later on, certainly, he gets distrustful of the whole metaphysical method of explanation; then perhaps it grows clear to him that those results can be obtained equally well and more scientifically in another way: that physical and historical explanations produce the feeling of personal relief to at least the same extent, and that the interest in life and its problems is perhaps still more aroused thereby.
Fundamental Questions of Metaphysics. – When the history of the rise of thought comes to be written, a new light will be thrown on the following statement of a distinguished logician: – "The primordial general law of the cognisant subject consists in the inner necessity of recognising every object in itself in its own nature, as a thing identical with itself, consequently self-existing and at bottom remaining ever the same and unchangeable: in short, in recognising everything as a substance." Even this law, which is here called "primordial," has evolved: it will some day be shown how gradually this tendency arises in the lower organisms, how the feeble mole-eyes of their organisations at first see only the same thing, – ;how then, when the various awakenings of pleasure and displeasure become noticeable, various substances are gradually distinguished, but each with one attribute, i. e. one single relation to such an organism. The first step in logic is the judgment, – the nature of which, according to the decision of the best logicians, consists in belief. At the bottom of all belief lies the sensation of the pleasant or the painful in relation to the sentient subject. A new third sensation as the result of two previous single sensations is the judgment in its simplest form. We organic beings have originally no interest in anything but its relation to us in connection with pleasure and pain. Between the moments (the states of feeling) when we become conscious of this connection, lie moments of rest, of non-feeling; the world and everything is then without interest for us, we notice no change in it (as even now a deeply interested person does not notice when any one passes him). To the plant, things are as a rule tranquil and eternal, everything like itself. From the period of the lower organisms man has inherited the belief that similar things exist (this theory is only contradicted by the matured experience of the most advanced science). The primordial belief of everything organic from the beginning is perhaps even this, that all the rest of the world is one and immovable. The point furthest removed from those early beginnings of logic is the idea of Causality,– indeed we still really think that all sensations and activities are acts of the free will; when the sentient individual contemplates himself, he regards every sensation, every alteration as something isolated, that is to say, unconditioned and disconnected, – it rises up in us without connection with anything foregoing or following. We are hungry, but do not originally think that the organism must be nourished; the feeling seems to make itself felt without cause and purpose, it isolates itself and regards itself as arbitrary. Therefore, belief in the freedom of the will is an original error of everything organic, as old as the existence of the awakenings of logic in it; the belief in unconditioned substances and similar things is equally a primordial as well as an old error of everything organic. But inasmuch as all metaphysics has concerned itself chiefly with substance and the freedom of will, it may be designated as the science which treats of the fundamental errors of mankind, but treats of them as if they were fundamental truths.
Number. – The discovery of the laws of numbers is made upon the ground of the original, already prevailing error, that there are many similar things (but in reality there is nothing similar), at least, that there are things (but there is no "thing"). The supposition of plurality always presumes that there is something which appears frequently, – but here already error reigns, already we imagine beings, unities, which do not exist. Our sensations of space and time are false, for they lead – examined in sequence – to logical contradictions. In all scientific determinations we always reckon inevitably with certain false quantities, but as these quantities are at least constant, as, for instance, our sensation of time and space, the conclusions of science have still perfect accuracy and certainty in their connection with one another; one may continue to build upon them – until that final limit where the erroneous original suppositions, those constant faults, come into conflict with the conclusions, for instance in the doctrine of atoms. There still we always feel ourselves compelled to the acceptance of a "thing" or material "sub-stratum" that is moved, whilst the whole scientific procedure has pursued the very task of resolving everything substantial (material) into motion; here, too, we still separate with our sensation the mover and the moved and cannot get out of this circle, because the belief in things has from immemorial times been bound up with our being. When Kant says, "The understanding does not derive its laws from Nature, but dictates them to her," it is perfectly true with regard to the idea of Nature which we are compelled to associate with her (Nature = World as representation, that is to say as error), but which is the summing up of a number of errors of the understanding. The laws of numbers are entirely inapplicable to a world which is not our representation – these laws obtain only in the human world.
A Few Steps Back. – A degree of culture, and assuredly a very high one, is attained when man rises above superstitious and religious notions and fears, and, for instance, no longer believes in guardian angels or in original sin, and has also ceased to talk of the salvation of his soul, – if he has attained to this degree of freedom, he has still also to overcome metaphysics with the greatest exertion of his intelligence. Then, however, a retrogressive movement