If our dreams, night after night, were as coherent one with another as our days, we should hardly know whether to believe the dreams or the waking life. As it is, the test of coherence condemns the dreams and confirms the waking life. But this test, though it increases probability where it is successful, never gives absolute certainty, unless there is certainty already at some point in the coherent system.
Bertrand Russell (from The Problems of Philosophy, 1912)
[What is more reasonable: to say that we cannot be certain that we are not living in a dream because we cannot be logically certain; or to say that logic is only one of a number of tools for acquiring knowledge, and as regards this question common sense and not logic is the appropriate tool?]
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