The universe is a familiar conception. Everybody uses it, and there is apparently little to say about it. But in fact it is the conception of all conceptions, the being of all beings, the cause of itself which has no other cause and no other being beside itself. That the whole world is contained in the universe is so obvious that you may wonder at my waste of words over such a matter-of-fact thing. But when you consider that the people have always searched for a world cause outside of the world, together with a beginning of the world and a transcendental truth, then you will see that they have not grasped the conception of the world as a whole, as a universe. And if that is admitted, then the proof that it is the cause of all causes, the beginning of all beginnings, and the truth of all truths, is not such a superfluous undertaking. Now you may say that it is presumptuous to try to understand the whole universe at once. This objection is justified in a way, according to the interpretation of the words. Still I hope that it will be my justification to declare that it is not a question of understanding the universe in detail, but only in general, not each and everything in its differentiation, but only in a summary way. And it is only the edifying conception of the universe as a whole which will open for you the door to the understanding of the human mind, of thought, and the art of using it. We wish to understand _the_ conception; not this or that conception, but the whole conception, the conception of the whole. You will no longer indulge in the superstition that the faculty of thought or understanding is a thing apart from the world's interconnection. I presume that you have now learned enough about the art of thought to be sure not to think of anything without its worldwide interrelation. For so long as one imagines that a piece of wood or a stone is a thing in itself, without connection with light and air, with Earth, Moon, and Sun, he has a very barbarian conception of the things of this world. I maintain that the understanding of the human faculty of reason and the art of its use are inseparable from the world concept. And I want this understood in the sense, that it is not a mistake to distinguish between the internal mind and the outside world, but that these are merely formal distinctions of the essentially indivisible and absolute universe. The concept of this true God or divine, because universal, Truth shows on close analysis that it includes the special truth of the art of thought as well as all other sciences, and pre-eminently the science of thought, because this science must not limit itself to any special thing, but must be world wisdom by its very will and nature.