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  But let us see;– [w|W]e sometimes say ouside philosophy such things as “of course only he knows how he feels” or “I can't know what you feel”. Now how do we apply such a statement? Mostly it is an expression of helplessness like “I don't know what to do”. But this helplessness is not due to an unfortunate metaphysical ◇◇◇ fact, ‘the privacy of personal experience’, or it would worry us the
constantly
always
. Our expression is comparable to this: “What's done can't be undone!”.