《孟子·告子章句上》: 今夫弈之为数，小数也。不专心致志，则不得也。弈秋，通国之善弈者也。使弈秋诲二人弈，其一人专心致志，惟弈秋之为听；一人虽听之，一心以为有鸿鹄将至，思援弓缴而射之，虽与俱学，弗若之矣！as being "通国之善弈者", literally the finest Yi player of...