A sketch is in itself an inexact piece of work. I may be blamed for jumbling together such terms as world, cosmos, universe, nature, or such others as ideas, judgment, conclusion, thought, mind, intellect, etc., and for using them as synonyms when many of them have already been assigned their fixed meaning in the classification of science. But this is the point which I emphasize, that the method of science, of thought, has the twofold nature of making fixed terms and still remaining pliable. Science not only defines what this or that is, but also how it moves, how it originates, passes away, and still remains; how it is fixed and yet at the same time moving. The real being of which science treats, viz., the universe, is not alone present, but also past and future, and it is not alone this or that, but it is everything. Even nothing is something belonging to the aggregate life. This dialectic statement is rather incomprehensible to the unphilosophical brain. Nothing and something are conceptions so widely diverging from one another in the unphilosophical mind that they seem far more apart than heavenly bliss is supposed to be separated from earthly misery, according to the declarations of clergymen. Clergymen are transcendental logicians, and it is likewise transcendental to regard nothing as an absolute nothing. It cannot be denied that it is at least a conception or a term. Therefore, whether little or much, it is something. We cannot get out of existence, out of the universe, any more than Muenchhausen can pull himself out of a swamp by his pigtail. There can be no absolute nothing, because the absolute is synonymous with the universe, and everything else is relative. So it is also with nothing. It simply has the significance of not being the main thing. To say: This is nothing means it is not that which is essential at this time and place. This man is nothing simply means that he is not a man out of the ordinary, and it does not at all signify that he is nothing at all. The category of being and not being, like all categories,[10] which appear as something fixed to the sound but ill-informed mind, is really something shifting. Its poles fuse and flow into one another, its differences are not perfectly radical. These categories give us an illustration of the mobile universe, which is a unit composed of its opposite, multiplicity.