I am gathering from what I am learning of Taoism is that it is an evolving set of beliefs/tenets so anything written long ago that is at odds with what we now know is invalid or modifed to stay current. JimBob can correct me if I am wrong. I must say so far in my studies Taoism, if they really do change their beliefs to conform with mankinds pool of amassed knowledge, is the most sensible belief system I have yet seen even more so.. in my opinion.. then buddhism. .