14.] The same evolution of thought which is exhibited in the history of philosophy is presented in the System of Philosophy itself. Here, instead of surveying the process, as we do in history, from the outside, we see the movement of thought clearly defined in its native medium. The thought, which is genuine and self-supporting, must be intrinsically concrete; it must be an Idea; and when it is viewed in the whole of its universality, it is the Idea, or the Absolute. The science of this Idea must form a system. For the truth is concrete; that is, whilst it gives a bond and principle of unity, it also possesses an internal source of development. Truth, then, is only possible as a universe or totality of thought; and the freedom of the whole, as well as the necessity of the several sub-divisions, which it implies, are only possible when these are discriminated and defined. Unless it is a system, a philosophy is not a scientific production. Unsystematic philosophising can only be expected to give expression to personal peculiarities of mind, and has no principle for the regulation of its contents. Apart from their interdependence and organic union, the truths of philosophy are valueless, and must then be treated as baseless hypotheses, or personal convictions. Yet many philosophical treatises confine themselves to such an exposition of the opinions and sentiments of the author. The term _system_ is often misunderstood. It does not denote a philosophy, the principle of which is narrow and to be distinguished from others. On the contrary, a genuine philosophy makes it a principle to include every particular principle. 15.] Each of the parts of philosophy is a philosophical whole, a circle rounded and complete in itself. In each of these parts, however, the philosophical Idea is found in a particular specificality or medium. The single circle, because it is a real totality, bursts through the limits imposed by its special medium, and gives rise to a wider circle. The whole of philosophy in this way resembles a circle of circles. The Idea appears in each single circle, but, at the same time, the whole Idea is constituted by the system of these peculiar phases, and each is a necessary member of the organisation. 16.] In the form of an Encyclopaedia, the science has no room for a detailed exposition of particulars, and must be limited to setting forth the commencement of the special sciences and the notions of cardinal importance in them. How much of the particular parts is requisite to constitute a particular branch of knowledge is so far indeterminate, that the part, if it is to be something true, must be not an isolated member merely, but itself an organic whole. The entire field of philosophy therefore really forms a single science; but it may also be viewed as a total, composed of several particular sciences.