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Ludwig Wittgenstein

26 April 1889-29 April 1951

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Action is that which gains its meaning not from 'inner' accompaniments, but from its place within the background of regular practices, techniques and customs of a community. As we are initiated into a communal life-world, we become tuned in to those ways of responding that make up the background of intelligibility embodied in the 'common ways of acting'.

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Affect is (not a term Wittgenstein uses but he poses a question very relevant to affect discourse): 'When I see someone being killed-- is it simply what I see that makes an impression on me or does it come with the hypothesis that someone is being killed here''.

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A Belief is that which cannot be doubted. It concerns not metaphysical truths, but the grammatical impossibility of certain sentences. One, for example, cannot say: 'It is raining and I do not believe it'.

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Certainty is not about propositions but is about a foundational way of acting which underpins our epistemic activity.

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Color could conceivably be differentiated based on luster, such that shiny black and matt black would different color names.

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Death is not an event in life: We do not live to experience death. If we take eternity to mean not infinite temporal duration but timelessness, then eternal life belongs to those who live in the present.

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Doubt is that which we must have grounds for just as we do for belief. We do not have grounds to doubt 'I know I have a brain'.