some texts speak of the eighty-one transformations of ‘Lord Lao’); that means, throughout history he appeared in different guises to selected individuals to initiate them into the mysteries of the Dao, to secure cosmic harmony and sociopolitical order.
This passage establishes the doctrinal core of Lord Lao: as the personification of the Dao, he undergoes eighty-one transformations across history to transmit Daoist mysteries and sustain cosmic and political order.
, Daoism Handbook, 2000thesis