121. This argument seems to me one of the most conclusive than can be brought against Spinosa, who, together with the oneness of the substance admits extension, as one of its attributes. The extended is essentially multiplex; it always involves the distinction between its parts; we can always say of it: "The part A is not the part B." Pantheism cannot escape this argument except by taking refuge in pure idealism; and in this respect Fichte and Hegel are more logical than most persons give them credit for being. In order to maintain the exclusive oneness of substance, it is necessary to convert the external world into mere phenomena, whose only reality consists in their being thus presented to us. This is to absorb the world in the _me_, and concentrate the reality in the idea; but this absorption, this concentration, notwithstanding its obscurity, is a necessary and logical consequence of the principle established. There is absurdity, but there is at least the consequence of the absurdity. 122. Those who call Spinosa the disciple of Descartes, have not observed that there is a necessary contradiction between the two systems. The argument founded on extension, which I have just presented, although conclusive under every hypothesis, is still more so against those who admit with Descartes, that the essence of bodies consists in extension. In that case, the various parts of extension are essentially distinct, since each part constitutes an essence. The essential and substantial multiplicity of bodies would be in proportion to the multiplicity of extension.