TWENTIETH LETTER
Dear Eugene:
Today I am going to present my case with the precision of a schoolmaster.
The concept of white cabbage embraces all white cabbage heads that ever were and ever will be.
The concept of cabbage embraces red, white, and many other kinds of cabbage. The concept of vegetable embraces a still wider range. The organic field is still more comprehensive. And finally the world concept embraces everything which we know and don't know, the end of which we cannot conceive, and which therefore is called infinite.
When we trace our steps backward over the same reasoning, we find at once that the universal concept is divided into two parts, viz., the universe and the conception of it. We thus find the world in the concept and the concept in the world, so that both of these parts are interconnected, each is the predicate of the other, and whether we turn the thing to the right or to the left, the concept is in the world and the world in the concept.
Now it is true that the concept, or the faculty of understanding, is the object of our study rather than the world outside of it. The faculty of understanding, by the way, is nothing but a collective noun for all concepts, hence simply another name for concept in general. But what I eternally repeat is this: We cannot make a concept separated from all the rest of the world the object of our study, because that would be an empty abstraction which does not take on any meaning until we connect it with the world, for instance the special concept of cabbage with sense-perceived cabbage and so forth.
The concepts of white cabbage, cabbage in general, vegetables, or plants, etc., are all of them special concepts and at the same time general concepts. The one and the other is relative. Compared to the various species it includes, the general concept of cabbage is abstract, while compared to the general concept of vegetables it is concrete. And so it is with all concepts. They are abstract and concrete at the same time. Only the final concept, the world concept, is neither concrete nor abstract, but absolute. It is the concept of the absolute, which is indispensable for an understanding of logic.
We found a while ago that the absolute world concept consisted of two parts, viz., the concept and the world. In the same way, the chemists teach us that water consists of two elements, each of which by itself does not make any water, while their compound makes pure water. But we do not need such distant illustrations. My table in its present composition is something different from what it would be if the same pieces were put together in some other way and without a plan.