This presupposition of the Judgement is, however, at the same time so indeterminate as to how far that ideal purposiveness of nature for our cognitive faculty should be extended, that if we were told that a deeper or wider knowledge of nature derived from observation must lead at last to a variety of laws, which no human Understanding could reduce to a principle, we should at once acquiesce. But still we more gladly listen to one who offers hope that the more we know nature internally, and can compare it with external members now unknown to us, the more simple shall we find it in its principles, and that the further our experience reaches the more uniform shall we find it amid the apparent heterogeneity of its empirical laws. For it is a mandate of our Judgement to proceed according to the principle of the harmony of nature with our cognitive faculty so far as that reaches, without deciding (because it is not the determinant Judgement which gives us this rule) whether or not it is bounded anywhere. For although in respect of the rational use of our cognitive faculty we can determine such bounds, this is not possible in the empirical field. VII. OF THE AESTHETICAL REPRESENTATION OF THE PURPOSIVENESS OF NATURE. That which in the representation of an Object is merely subjective, _i.e._ which decides its reference to the subject, not to the object, is its aesthetical character; but that which serves or can be used for the determination of the object (for cognition), is its logical validity. In the cognition of an object of sense both references present themselves. In the sense-representation of external things the quality of space wherein we intuite them is the merely subjective [element] of my representation (by which it remains undecided what they may be in themselves as Objects), on account of which reference the object is thought thereby merely as phenomenon. But space, notwithstanding its merely subjective quality, is at the same time an ingredient in the cognition of things as phenomena. _Sensation_, again (_i.e._ external sensation), expresses the merely subjective [element] of our representations of external things, but it is also the proper material (reale) of them (by which something existing is given), just as space is the mere form _a priori_ of the possibility of their intuition. Nevertheless, however, sensation is also employed in the cognition of external Objects.