Everything you need to understand or teach The Remarkable Journey of Prince Jen by Lloyd Alexander.
The Remarkable Journey of Prince Jen is a harrowing adventure in which Young Lord Prince Jen learns through personal experience about the injustices of his kingdom of T'ang. The mysterious Master Wu sets in motion Jen's journey to the kingdom of T'ien-kuo, where the great Yuan-ming rules justly and laws are seldom enforced because the people follow the rule of doing to others what they would like others to do to them. Jen is sent to this ideal land to learn from Yuan-ming how to rule justly so that the T'ang people will prosper and be happy, but he never reaches the great northern kingdom, which may well be mythical. This does not matter in the end since Jen fulfils his quest by finding what he seeks in his own kingdom, learning what he must do when he is king to make his rule wise and compassionate.