The "Resolution on Several Historical Issues of the Party Since the Founding of the People's Republic of China" is an important document with the most far-reaching influence in the history of the Communist Party of China. While summarizing the history, it provides a historical and theoretical basis for establishing China's next phase of the line and program, and also provides a historical and theoretical basis for Deng Xiaoping and others to redistribute the power of the state and the party.
There are actually numerous answers to this question. One could be the Supreme Court Justices since they serve lifetime or until they decide to retire.