Hume is the skeptic that maintains we cannot know with certainty what is beyond our senses, but that we have come to rely on custom, or habit, for what we do know. When we hit a billiard ball a particular way and observe its effect, and then witness the same thing over and over again, we come to expect that this is the way it is with billiard balls. This also applies to human/social phenomena, as this excerpt shows.
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Should a traveller, returning from a far country, bring us an account of men, wholly different from any, with whom we were ever acquainted; men, who were entirely divested of avarice, ambition, or revenge; who knew no pleasure but friendship, generosity, and public spirit; we should immediately, from these circumstances, detect the falsehood, and prove him a liar, with the same certainty as if he had stuffed his narration with stories of centaurs and dragons, miracles and prodigies.
-- David Hume, “An Enquiry concerning Human Understanding”
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Should a traveller, returning from a far country, bring us an account of men, wholly different from any, with whom we were ever acquainted; men, who were entirely divested of avarice, ambition, or revenge; who knew no pleasure but friendship, generosity, and public spirit; we should immediately, from these circumstances, detect the falsehood, and prove him a liar, with the same certainty as if he had stuffed his narration with stories of centaurs and dragons, miracles and prodigies.
-- David Hume, “An Enquiry concerning Human Understanding”
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