robert wrote: There are a lot of shades of gray between internal and external.
Seems to be a reoccurring theme.
For clarification my view
All CMA is "internal" having been developed in the culture that makes this distinction.
The distinctions, IME help clarify, expressions, method and usage ,,that the internal is used to develop or enhance.
ie either to be a conductor of it, or the output of it....
Are quite different, noted by those I've encountered over the yrs consistently expressing the same
In the end it means there are certain aspects that cannot be done any other way with really understanding the distinctions....
Among the masters that most use to illustrate the distinctions, its quite clear.
Maybe not so much in common practice...