It is really very nice to know there are still taoist ascetics. I intend to start mandarin soon. By the way, as you already talked about a book written by the Yellow Emperor, i have read that Yellow Emperor also wrote a book called Yin Fu Jing, i think it is "Harmony between visible and invisible" or something similar. Is it available? I have tried to find it but i havent managed it and i was strting to think that it may be a legend...