Heidegger believed that Aristotle's notion of Being – which had run as a thread through Western thinking for more than 2,000 years, and been instrumental in the development of scientific thinking – was flawed at a most fundamental level. Whereas Aristotle saw all of existence, including human beings, as things we could classify and analyse to increase our understanding of the world, in Being and Time (1927) Heidegger argued that, before we start classifying Being, we should first ask the question: 'Who or what is doing all this questioning?'

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