15. The Theory of Categories
Already we have four sequent categories: SEIN, NICHTSEIN, WERDEN, DASEIN. We could then go on and cause every possible thing to germinate out of DASEIN, and we would obtain a rich DASEIN from this one line. But we can also go otherwise to work. SEIN can also be developed on the other side; this is very fruitful. The pure idea (Gedanke) of the SEIN (existence) is projected into reality in thinking.[^5] At the moment when we grasp the concept SEIN we must designate it as WESEN (Nature, essence, being, i.e. existent but not outwardly. Tr.)
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