The first man drew a small circle in the sand and told...

      The first man drew a small circle in the sand and told the second man, “This is what you know”, and drawing a circle around the small one, “This is what I know”. The second man took the stick and drew an immense ring around both circles: “This is where both of us know nothing”.

                                   (Adapted from Carl Sandburg (1878-1967), american poet) 

The first man thought the second man knew __________.