The success of the method depends on the sincere application of conscious thought upon the relation between apparent external events and the apparent Identity.
The Aversive mind sincerely upon a spiritual task is generally trapped in its own smug superiority. His quest is the Awakening which he fails to grasp because of the craving for that state and the clinging to a mental method to secure it. He fails to understand the more subtle aspects of the natural experience.
The Master must wait for those seldom-experienced moments when the student is perched upon that point where he perceives a mind-constructed ULTIMATE CONCEPTUALIZATION which he cannot build easily in seated contemplation.
When the master detects that his student's cognitive mind is resting upon some frugal task yet is also balanced upon the last abstract conceptualization of the Vacuity of "Identity" together with the word experience related to that concept (which normally for that student is converted into an intellectual fracas), the master then strikes, forcing the immediate cessation of conscious thought.
The adept is then thrust without consciousness into the dimension of undifferentiated form, which is the right-brain process which allows a particularization of FORM from NON-DIFFERENTIATED FORM.
In the modern stained Samsara, apart from the fact that the system is little understood by Masters themselves, the situation is rare where a student is committed to the task and can accept a hard taskmaster who does not permit intellectual nitpicking.
It is important to note that the student must be forced away from any mentally-directed abstract symbolism, directing his cognition instead to EXPERIENCES not WORD- PICTURES: the fall of a torrent, the trajectory of the stars, the experience of the style of a potter, not its description, all of which reflect the true "second truth" when the last conceptualization of the "first truth of illusion" is pierced.
It is the vacuity of these experiences, which are conceptual, that allows the true experience of Vacuity to be opened.