By keeping to the Middle Path of non-attachment, no thought appertaining to either extreme can take root and grow. On any other Path, thoughts, becoming fixed on evil, turn into an army of demons
Evans-Wentz defines the Middle Path as the practice of non-attachment that prevents extremist fixation, framing deviation from it as literal psychic enslavement to demonic thought-formations.
, The Tibetan Book of the Great Liberation, 1954thesis