No sign will be given to this generation except the sign of Jonah.

While still more people gathered in the crowd, Jesus said to them, 
          “This generation is an evil generation; 
          it seeks a sign, but no sign will be given it, 
          except the sign of Jonah.  
Just as Jonah became a sign to the Ninevites, 
          so will the Son of Man be to this generation.