Wittgenstein was convinced that he had successfully answered all of philosophy's main questions, and he abandoned the profession in favor of teaching elementary school in the Austrian Alps. Shunning what he considered the trappings of wealth, Wittgenstein had by then given away his share of the family fortune. When he grew disillusioned with teaching elementary school, he worked as a gardener in a nearby monastery, taking time off to design a house for one of his sisters. Seven years later, in 1929, Wittgenstein returned to Cambridge as a research fellow at Trinity College, where he was awarded a doctorate in philosophy on the basis of the Tractatus. However, by this time, he had begun to develop a new vision of philosophy, culminating in his work Philosophical Investigations, which was to cause a second revolution in philosophy.
In 1939, he was appointed to the chair of philosophy at Cambridge. During this period, he filled many notebooks with philosophical reflections, some of which he circulated among his students, but he did not allow any of his works to be published during his lifetime. At the beginning of World War II, he volunteered as a hospital orderly in London. After the war, he returned to Cambridge again but, after two years, he resigned his position and went to live in seclusion in Ireland, where he continued to write and where he completed the manuscript, Philosophical Investigations, which was published posthumously in 1953. Subsequently, many of Wittgenstein's notebooks were edited and published. The most important of these include The Blue and Brown Books (1958), Zettel (1967), On Certainty (1969), Remarks on the Foundations of Mathematics (1978), and Remarks on the Philosophy of Psychology (1980).
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