""I exist" does not follow from "there is a thought now." The fact that a thought occurs at a given moment does not entail that any other thought has occurred at any other moment, still less that there has occurred a series of thoughts sufficient to constitute a single self. As Hume conclusively showed, no one event intrinsically points to any other. We infer the existence of events which we are not actually observing, with the help of general principle. But these principles must be obtained inductively. By mere deduction from what is immediately given we cannot advance a single step beyond. And, consequently, any attempt to base a deductive system on propositions which describe what is immediately given is bound to be a failure."
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A. J. Ayer
Sir Alfred Jules Ayer (29 October 1910 – 27 June 1989), more often referred to as A. J. Ayer or Freddie Ayer, was a British humanist philosopher, who was one of the leading proponents of logical positivism.
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