How do we know what colour a person sees? By the sample he points to? And how do we know wheth what relation the sample is ˇmeant to have to the original? Now are we to say “we never know …”? Or had we better cut out these “we never know … ” ˇout of our language & [k|c]onsider how as a matter of fact we are wont to use the word “to know”?