15. The Theory of Categories
Today I cannot go into the historical development of the system of categories, but only show how in the main Hegel, the great master of categorical theory, has developed the system of concepts. Hegel is today perhaps the least understood philosopher. And when anything is ever said about him, it is worth but little. Wherefore people are still apt to say today, as they always said in his lifetime: he wants to develop the whole world in concepts. Even the Leipzig philosopher Krug understood him as though he wanted to construct the rose out of spiritual perceptions, as though one ought to develop it from concepts. Whereupon he received the answer, that it is not quite evident why the writing pen itself of the Leipzig philosopher should (not) be constructed of pure concepts.[^4]