Lumifer comments on Does Evidence Have To Be Certain? - Less Wrong Discussion
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Presumably because you got some new information. If there is no information, there is no update. If the information is uncertain, make appropriate adjustments. The "infinite regress" would either converge to some limit or you'll end up, as OrphanWilde says, with Descartes' deceiving demon at which point you don't know anything and just stand there slack-jawed till someone runs you over.