The mind must still be ‘calmed’ before these methods work, regardless of lineage. However, Zhao Bichen considered his main masters to be two Ch’an Buddhist monks (who together passed on the Wu Liu Daoist lineage to him). Their input added the Ch’an method of ‘hua tou’ to the Daoist practice.
That is pain, which seems to be a very important issue for human beings. As for myself, I am certainly not immune to pain, but am not interested in it. Yes pain happens from time to time, but as it is passing, I am aware that it is not permanent. In this respect I am lucky because many people suffer all the time and never have a break from the experience. I would say that life is mostly a neutral experience with outbreaks of pleasure and pain from time to time.
Become aware of the cycles of happiness and grief and do not be arrogant,