James Legge 
Taoist Sacred Texts Vol II [EPUB ebook] 

The mysticism of Tâoism is of a nature peculiar to itself, and different from any mental exercises which have been called by that name in connexion with Christianity or Mohammedanism. It is more vague and shadowy than any theosophy or Sûfism, just as the idea of the Tâo differs from the apprehension of a personal God, however uncertain and indefinite that apprehension may be.