"Knowledge is proud that he has learned so much;
  Wisdom is humble that he knows no more."
      William Cowper (1731-1800); English poet. (来源：英语麦当劳 http://www.EnglishCN.com)

"The important thing is not to listen to what other people say,  but find out what they think".
   Juan Donoso Cort? (1809-1853); Spanish diplomat, essayist