Internal and external are all the same function.
Take up all the phenomena of the physical universe, internal, external, mental or physical as well as motion and activity, and regard them all as the sublime activity of the True Mind (Awareness). As soon as any thought or mental state arises, it is then the appearance of this sublime function. Since all things are this sublime functioning, where can the deluded mind stand? This is the method of extinguishing delusion by seeing that all things external and internal are the same function of the True Mind (Buddha Nature).
Zen Master Chinul
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