You say that it's obvious to you that there's something the word pain means. But it doesn't you're not satisf[y|i]ed you, for in the next moment you
can imagine
think
that it might be any
number of things corresponding to the word pain, & then again that there is not anything corresponding to the word pain but that what seemed to correspond to it was really part of the experience of saying it; etc..
  In other words the pictures vary & replace one another, whereas the language game however remains,
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only it doesn't really seem to interest us. If it did we wouldn't philosophize.