15. The Theory of Categories

Now what [do] we get when we have developed four such concepts within us and gained them in this way? We get much from them. In the concept of WERDEN then, we are thinking of nothing else than of what we have learned as content of the concept. We must forthwith exclude everything that does not belong to the concepts. Only SEIN AND NICHTSEIN belong thereto. Wherefore a strictly trained thinker is so hard to understand. When a concept is spoken of, one ought really just as little to think in connection with [it] of something diverse from it as in the case of the concept ‘triangle’. Dialectic is a splendid schooling for thinking.