as sensation, they have to be brought within consciousness--to find a home in the understanding--as ideas of sensation. Meanwhile the consideration returns that after all the ‘thinking thing’ contributes something to that which it thinks about; and, this once admitted, it is as impossible to limit its work on one side as that of the outer thing on the other. Each usurps the place of its opposite. Thus with Locke the understanding produces effects on itself, but the product is one and the same ‘perception’ otherwise treated as an effect of the outer world. One and the same self-consciousness, in short, [1] involving the correlation of subject and object, becomes the result of two separate ‘things,’ each exclusive of the other, into which the opposite poles of this relation have been converted--the extended thing or ‘body’ on the one side, and the thinking thing or ‘mind’ on the other. [1] For the equivalence of perception with self-consciousness in Locke, see above, paragraph 24, et infra. Difficulties in the way of ascribing reality to substance as matter, re-appear in regard to substance as mind. 133. To each of these supposed ‘things’ thought transfers its own unity and self-containedness, and thereupon finds itself in new difficulties. These, so far as they concern the outward thing, have already been sufficiently noticed. We have seen how the single self-contained thing on the one hand attenuates itself to the bare atom, presented in a moment of time, which in its exclusiveness is actually nothing: [1] how, on the other, it spreads itself, as everything which for one moment we regard as independent turns out in the next to be a ‘retainer’ to something else, into a series that cannot be summed. [2] A like consequence follows when the individual man, conceiving of the thought, which is not mine but me, and which is no less the world without which I am not I, as a thinking thing within him, limited by the limitations of his animal nature, seeks in this thinking thing, exclusive of other things, that unity and self-containedness, which only belong to the universal ‘I.’ He finds that he ‘thinks not always;’ that during a fourth part of his time he neither thinks nor perceives at all; and that even in his waking hours his consciousness consists of a succession of separate feelings, whose recurrence he cannot command. [3] Thought being thus broken and dependent, substantiality is not to be found in it. It is next sought in the ‘thing’ of which thought is an occasional operation--a thing of which it may readily be admitted that its nature cannot be known (Book II. chap, xxiii. sec. 29, etc.), since it has no nature, being merely that which remains of the thinking thing upon abstraction of its sole determination. It is in principle nothing else than the supposed basis of sensible qualities remaining after these have been abstracted--the ‘parcel of matter’ which has no essence--with which accordingly Locke sometimes himself tends to identify it.