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     But let us see;– We sometimes say outside 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 always || constantly. Our expression is comparable to this: “What's done can't be undone!”.