Zettel Book

I have been studying Wittgenstein for 35 years. Each time I study his works I am always drawn back to Zettel and On Certainty. He created two distinct philosophies of the 20th century with Tractatus Logico (and Notebooks) and Philosophical Investigations (and the Blue and Brown Books). Zettel allows us to lean into his thinking in an almost step by step manner. I cannot imagine Philosophical Investigations, an essential work. without Zettel, On Certainty and Remarks on Philosophy of Psychology. What is important is the question. We question, of course, but how a question is framed allows us to reign in a particular line of thought without bogging down in the margins of an intellectual course of action. There is no 20th century philosophy without Wittgenstein and Heidegger.