I shall suggest on the contrary that all communication relies to a noticeable extent on evoking knowledge that we cannot tell and that all our knowledge of mental processes like feelings or conscious intellectual activities is based on a knowledge which we cannot tell.
We can't go to people who have lost their job at GM and say 'Oh by the way we are going to pay money to build a road here or inoculate children there ' unless we can demonstrate that it is in America's interest. I happen to think it is.
