^In fact, the Yangs never said anything about how old the documents are. Cloud William only talked about "the holy words," not "the ancient holy words" or "the traditions handed down from ancient times" or anything like that. Nothing whatsoever was said about the age of their traditions or texts. Viewers have just assumed that the traditions were ancient, because that's what people usually assume about other cultures' traditions. I learned in my college history studies that this is a common mistake even among anthropologists -- assuming that a culture's customs and traditions at the time of contact are unchanged since antiquity. In reality, every culture is dynamic and evolving, and traditions and beliefs change from generation to generation. Even those groups that claim their beliefs represent ancient tradition may be interpreting those traditions in a way the ancients wouldn't have recognized.