This makes it easy to us to comprehend the aim of Philosophy, which is in thought and in conception to grasp the Truth, and not merely to discover that nothing can be known, or that at least temporal, finite truth, which also is an untruth, can alone be known and not the Truth indeed. Further we find that in the history of Philosophy we have to deal with Philosophy itself. The facts within that history are not adventures and contain no more romance than does the history of the world. They are not a mere collection of chance events, of expeditions of wandering knights, each going about fighting, struggling purposelessly, leaving no results to show for all his efforts. Nor is it so that one thing has been thought out here, another there, at will; in the activity of thinking mind there is real connection, and what there takes place is rational. It is with this belief in the spirit of the world that we must proceed to history, and in particular to the history of Philosophy. 2. EXPLANATORY REMARKS UPON THE DEFINITION OF THE HISTORY OF PHILOSOPHY. The above statement, that the Truth is only one, is still abstract and formal. In the deeper sense it is our starting point. But the aim of Philosophy is to know this one Truth as the immediate source from which all else proceeds, both all the laws of nature and all the manifestations of life and consciousness of which they are mere reflections, or to lead these laws and manifestations in ways apparently contrary, back to that single source, and from that source to comprehend them, which is to understand their derivation. Thus what is most essential is to know that the single truth is not merely a solitary, empty thought, but one determined within itself. To obtain this knowledge we must enter into some abstract Notions which, as such, are quite general and dry, and which are the two principles of _Development_ and of the _Concrete_. We could, indeed, embrace the whole in the single principle of development; if this were clear, all else would result and follow of its own accord. The product of thinking is the thought; thought is, however, still formal; somewhat more defined it becomes Notion, and finally Idea is Thought in its totality, implicitly and explicitly determined. Thus the Idea, and it alone is Truth. Now it is essentially in the nature of the Idea to develop, and only through development to arrive at comprehension of itself, or to become what it is. That the Idea should have to make itself what it is, seems like a contradiction; it may be said that it is what it is. a. _The Notion of Development._ The idea of development is well known, but it is the special characteristic of Philosophy to investigate such matters as were formerly held as known. What is dealt with or made use of without consideration as an aid to daily life, is certainly the unknown to man unless he be informed in Philosophy. The further discussion of this idea belongs to the science of Logic.