(3) To regard the categories as subjective only, _i.e._ as a part of ourselves, must seem very odd to the natural mind; and no doubt there is something queer about it. It is quite true however that the categories are not contained in the sensation as it is given us. When, for instance, we look at a piece of sugar, we find it is hard, white, sweet, &c. All these properties we say are united in one object. Now it is this unity that is not found in the sensation. The same thing happens if we conceive two events to stand in the relation of cause and effect. The senses only inform us of the two several occurrences which follow each other in time. But that the one is cause, the other effect,--in other words, the causal nexus between the two,--is not perceived by sense; it is only evident to thought. Still, though the categories, such as unity, or cause and effect, are strictly the property of thought, it by no means follows that they must be ours merely and not also characteristics of the objects. Kant however confines them to the subject-mind, and his philosophy may be styled subjective idealism: for he holds that both the form and the matter of knowledge are supplied by the Ego--or knowing subject--the form by our intellectual, the matter by our sentient ego. So far as regards the content of this subjective idealism, not a word need be wasted. It might perhaps at first sight be imagined, that objects would lose their reality when their unity was transferred to the subject. But neither we nor the objects would have anything to gain by the mere fact that they possessed being. The main point is not, that they are, but what they are, and whether or not their content is true. It does no good to the things to say merely that they have being. What has being, will also cease to be when time creeps over it. It might also be alleged that subjective idealism tended to promote self-conceit. But surely if a man's world be the sum of his sensible perceptions, he has no reason to be vain of such a world. Laying aside therefore as unimportant this distinction between subjective and objective, we are chiefly interested in knowing what a thing is: _i.e._ its content, which is no more objective than it is subjective. If mere existence be enough to make objectivity, even a crime is objective: but it is an existence which is nullity at the core, as is definitely made apparent when the day of punishment comes. 43.] The Categories may be viewed in two aspects. On the one hand it is by their instrumentality that the mere perception of sense rises to objectivity and experience. On the other hand these notions are unities in our consciousness merely: they are consequently conditioned by the material given to them, and having nothing of their own they can be applied to use only within the range of experience. But the other constituent of experience, the impressions of feeling and perception, is not one whit less subjective than the categories.