Hegel develops the metaphysical theory further by getting rid of the idea of occupation and treating property as a realization of the idea of liberty. Property, he says, "makes objective my personal, individual will." In order to reach the complete liberty involved in the idea of liberty, one must give his liberty an external sphere. Hence a person has a right to direct his will upon an external object and an object on which it is so directed becomes his. It is not an end in itself; it gets its whole rational significance from his will. Thus when one appropriates a thing, fundamentally he manifests the majesty of his will by demonstrating that external objects that have no wills are not self-sufficient and are not ends in themselves. It follows that the demand for equality in the division of the soil and in other forms of wealth is superficial. For, he argues, differences of wealth are due to accidents of external nature that give to what A has impressed with his will greater value than to what B has impressed with his, and to the infinite diversity of individual mind and character that leads A to attach his will to this and B to attach his will to that. Men are equal as persons. With respect to the principle of possession they stand alike. Everyone must have property of some sort in order to be free. Beyond this, "among persons differently endowed inequality must result and equality would be wrong." Nineteenth-century metaphysical theories of property carry out these ideas or develop this method. And it is to be noted that they are all open to attack from the standpoint of the theory of _res extra commercium_. Thus Hegel's theory comes to this: Personality involves exercise of the will with respect to things. When one has exercised his will with respect to a thing and so has acquired a power of control over it, other wills are excluded from this thing and are to be directed toward objects with which other personalities have not been so identified. So long as there are vacant lands to occupy, undeveloped regions awaiting the pioneer, unexploited natural resources awaiting the prospector--in short, so long as there are enough physical objects in reach, if one may so put it, to go round--this would be consistent with the nineteenth-century theory of justice. But when, as at the end of the nineteenth century, the world becomes crowded and its natural resources have been appropriated and exploited, so that there is a defect in material nature whereby such exercise of the will by some leaves no objects upon which the wills of others may be exerted, or a deficiency such as to prevent any substantial exertion of the will, it is difficult to see how Hegel's argument may be reconciled with the argument put behind the conception of _res extra commercium_. Miller, a Scotch Hegelian, seeks to meet this difficulty. He says that beyond what is needed for the natural existence and development of the person, property "can only be held as