为人民服务从基础往上可分为为人民有偿服务、为人民义务服务、为人民无偿服务三个层次。为人民无偿服务特别是其中的全心全意为人民服务是人类道德的最高层次。 Serving the people from the foundation can be divided into three levels, namely, paid services for the people, volunteer services for the people and free services for the people. It is the highest level of human morality to provide people with unpaid service, especially one of serving the people wholeheartedly.