A man of a good heart is not impolite to others. He keeps the rules and disciplines of his society and promises with other people well. For example, he would keep the order when he gets on vehicles, or he would not throw garbages even if nobody is around. A heart that does not complain about people who conduct evil things, a heart that humbles oneself, a heart that keeps peace and gives away, a heart without greed, a heart that does not boast, a heart that is pleased with the truth all belong to good heart. Therefore, we should have this kind of heart and live a life that sets an example to all people.