The Nine Stages of Settling the Mind
There are nine stages of settling the mind into a state of shamatha:
5. Taming. Here, we no longer experience gross flightiness, the subtle flightiness of an undercurrent of thought, or gross or middling dullness. However, because we have overstrained to concentrate and have sunk too deeply inwards, we have relaxed the appearance-producing factor giving rise to the appearance of the object of focus. Consequently, we experience subtle dullness. We need to refresh and uplift the mental hold by remembering the benefits of gaining shamatha.
6. Stilling. Here, although there is no longer great danger of subtle mental dullness, nevertheless in uplifting the mind, we became too excited and the mental hold became too tight. Consequently, we experience the subtle flightiness of itchiness to leave the object of focus. We need to use strong alertness to detect this and to relax our mental hold slightly.