Now, if this thing-in-itself (we will retain the Kantian expression as a standing formula)—which as such is never object, since all object is its mere appearance or phenomenon, and not it itself—is to be thought of objectively, then we must borrow its name and concept from an object, from something in some way objectively given, and therefore from one of its phenomena. But in order to serve as a point of explanation, this can be none other than the most complete of all its phenomena, i.e., the most distinct, the most developed, the most directly enlightened by knowledge; but this is precisely man’s will. We have to observe, however, that here of course we use only a denominatio a potiori, by which the concept of will therefore receives a greater extension than it has hitherto had. Knowledge of the identical in different phenomena and of the different in similar phenomena is, as Plato so often remarks, the condition for philosophy. But hitherto the identity of the inner essence of any striving and operating force in nature with the will has not been recognized, and therefore the many kinds of phenomena that are only different species of the same genus were not regarded as such; they were considered as being heterogeneous. Consequently, no word could exist to describe the concept of this genus. I therefore name the genus after its most important species, the direct knowledge of which lies nearest to us, and leads to the indirect knowledge of all the others. But anyone who is incapable of carrying out the required extension of the concept will remain involved in a permanent misunderstanding. For by the word will, he will always understand only that species of it hitherto exclusively described by the term, that is to say, the will guided by knowledge, strictly according to motives, indeed only to abstract motives, thus manifesting itself under the guidance of the faculty of reason. This, as we have said, is only the most distinct phenomenon or appearance of the will. We must now clearly separate out in our thoughts the innermost essence of this phenomenon, known to us directly, and then transfer it to all the weaker, less distinct phenomena of the same essence, and by so doing achieve the desired extension of the concept of will. From the opposite point of view, I should be misunderstood by anyone who thought that ultimately it was all the same whether we expressed this essence-in-itself of all phenomena by the word will or by any other word. This would be the case if this thing-in-itself were something whose existence we merely inferred, and thus knew only indirectly and merely in the abstract. Then certainly we could call it what we liked; the name would stand merely as the symbol of an unknown quantity. But the word will, which, like a magic word, is to reveal to us the innermost essence of everything in nature, by no means expresses an unknown quantity, something reached by inferences and syllogisms, but something known absolutely and immediately, and that so well that we know and understand what will is better than anything else, be it what it may. Hitherto, the concept of will has been subsumed under the concept of force; I, on the other hand, do exactly the reverse, and intend every force in nature to be conceived as will. We must not imagine that this is a dispute about words or a matter of no consequence; on the contrary, it is of the very highest significance and importance. For at the root of the concept of force, as of all other concepts, lies knowledge of the objective world through perception, in other words, the phenomenon, the representation, from which the concept is drawn. It is abstracted from the province where cause and effect reign, that is, from the representation of perception, and it signifies just the causal nature of the cause at the point where this causal nature is etiologically no longer explicable at all, but is the necessary presupposition of all etiological explanation. On the other hand, the concept of will is of all possible concepts the only one that has its origin not in the phenomenon, not in the mere representation of perception, but which comes from within, and proceeds from the most immediate consciousness of everyone. In this consciousness each one knows and at the same time is himself his own individuality according to its nature immediately, without any form, even the form of subject and object, for here knower and known coincide. Therefore, if we refer the concept of force to that of will, we have in fact referred something more unknown to something infinitely better known, indeed to the one thing really known to us immediately and completely; and we have very greatly extended our knowledge. If, on the other hand, we subsume the concept of will under that of force, as has been done hitherto, we renounce the only immediate knowledge of the inner nature of the world that we have, since we let it disappear in a concept abstracted from the phenomenon, with which therefore we can never pass beyond the phenomenon.