apparent other-being and the knowledge of the necessity of the thing through itself. It is now quite a matter of indifference whether anything is accepted as something experienced, as a succession of empirical ideas, if one may so say, or conceptions; or whether the succession is a succession of thoughts, _i.e._ implicitly existent. Locke treats of the various kinds of these ideas imperfectly and empirically merely. α. According to Locke simple ideas arise partly from outward, and partly from inward experience. For experiences, he says, are in the first place sensations; the other side is reflection, the inward determinations of consciousness.[218] From sensation, from the organs of sight for instance, the conceptions of colour, light, etc., arise; there further arises from outward experience the idea of impenetrability, of figure, rest, motion and such like. From reflections come the ideas of faith, doubt, judgment, reasoning, thinking, willing, etc.; from both combined, pleasure, pain, etc. This is a very commonplace account of the matter. β. After Locke has presupposed experience, he goes on to say that it is the understanding which now discovers and desires the universal—the complex ideas. The Bishop of Worcester made the objection that “If the idea of substance be grounded upon plain and evident reason, then we must allow an idea of substance which comes not in by sensation or reflection.” Locke replies: “General ideas come not into the mind by sensation or reflection, but are the creatures or inventions of the understanding. The mind makes them from ideas which it has got by sensation and reflection.” The work of the mind now consists in bringing forth from several simple so-called ideas a number of new ones, by means of its working upon this material through comparing, distinguishing and contrasting it, and finally through separation or abstraction, whereby the universal conceptions, such as space, time, existence, unity and diversity, capacity, cause and effect, freedom, necessity, take their rise. “The mind in respect of its simple ideas is wholly passive, and receives them all from the existence and operation of things, such as sensation or reflection offers them, without being able to make any one idea.” But “the mind often exercises an active power in making these several combinations. For it being once furnished with simple ideas it can put them together in several combinations.” According to Locke therefore thought itself is not the essence of the soul, but one of its powers and manifestations. He maintains thought to be existent in consciousness as conscious thought, and thus brings it forward as a fact in his experience, that we do not always think. Experience demonstrates dreamless sleep when the sleep is profound. Locke quotes the example of a man who remembered no dream until he had reached his twenty-fifth year. It is as in the Xenien,—[219] Oft schon war ich, und hab’ wirklich an gar nichts gedacht.