“But the point is just that we don't
assume
that
we have
toothache.
Therefore even if we have no ground
for assuming that
anyone else has
toothache we may nevertheless
know that we have.”
But would we in this case at all talk of a
(
particular) behaviour as a symptom of pains?
“Suppose no one knew pains except I, & I just invented a name
‘abracadabra’ for it!”