By this consciousness, in which subject and object are not yet set apart, we reach something universal. In itself the Will is not individualised, but exists whole and undivided in every single thing in nature, as the Subject of contemplation exists whole and undivided in each cognitive being. It is entirely free from all forms of the phenomenon. What makes plurality possible is subjection to the forms of time and space, by which only the phenomenon is affected. Time and space may therefore be called, in scholastic terminology, the 'principle of individuation.' While each of its phenomena is subject to the law of sufficient reason, which is the law of appearance in these forms, there is for the Will as thing-in-itself no rational ground: it is 'grundlos.' It is free from all plurality, although its phenomena in space and time are innumerable. It is one, not with the unity of an object or of a concept, but as that which lies outside of space and time, beyond the _principium individuationis_, that is, the possibility of plurality. The individual, the person, is not will as thing-in-itself, but phenomenon of the will, and as such determined. The will is 'free' because there is nothing beyond itself to determine it. Further, it is in itself mere activity without end, a blind striving. Knowledge appears only as the accompaniment of its ascending stages. Here we have arrived at the thought which, in its various expressions, constitutes Schopenhauer's metaphysics. That this cannot be scientifically deduced he admits; but he regards it as furnishing such explanation as is possible of science itself. For science there is in everything an inexplicable element to which it runs back, and which is real, not merely phenomenal. From this reality we are most remote in pure mathematics and in the pure _a priori_ science of nature as it was formulated by Kant. These owe their transparent clearness precisely to their absence of real content, or to the slightness of this. The attempt to reduce organic life to chemistry, this again to mechanism, and at last everything to arithmetic, could it succeed, would leave mere form behind, from which all the content of phenomena would have vanished. And the form would in the end be form of the subject. But the enterprise is vain. 'For in everything in nature there is something of which no ground can ever be given, of which no explanation is possible, no cause further is to be sought.' What for man is his inexplicable character, presupposed in every explanation of his deeds from motives, that for every inorganic body is its inexplicable quality, the manner of its acting.