Hi Peter,
Continuing on with a Kum Nye way of considering inner and outer, you might take a look at Ch. 5 “Breath, Energy, Feeling” in the second Kum Nye book, Joy Of Being. This book’s exploration of mind and perception in the “Massaging Mind” section might also be of interest. In addition, the discussions in the first Kum Nye book in “The Inner and Outer Massage of Feeling” are relevant, and see the first few pages of “Massage as part of practice” on pp. 59-62. Also see the chapter from Gesture of Balance, “Body, Breath, and Mind,” one of our readings.
There are various esoteric treatments of this topic, Buddhist and otherwise, but with regard to the Kum Nye approach and also to access the experiential and not necessarily adhere to the conceptual, the above are what I have found especially helpful. Also you might find interest in some essays in Tarthang Tulku’s Challenging Journey, Creative Journey – though these are pretty technical. See chapter 40, “The Winds of Freedom” and later chapters. Another kind of approach is taken in Rinpoche’s Dimensions of Mind.
I hope you find some interesting descriptions that are helpful to your practice.
Take care,
Abbe