8. Understanding as Equanimity for All Formations (Sankhar Upekkha Nana). This means, that because one cannot prevent the aggregates becoming old, getting sick, and dying on their own accord; one should let go of them and allow them to follow their natural condition. This is also called:
9. Understanding as Adaptation (Anuloma Nana), which is the highest form of understanding.
The above nine which follow one from the other, are called Insight (Vipassana). All nine are causes and results of each other, based on the “Understanding of Arising and Falling”. Where it mentions “Understanding as Adaptation”, this means that one should examine all three of one’s States of Becoming. These are: Sensual Becoming, Form Becoming, and Formless Becoming. All these states of Becoming are grouped together in the heart base, for it is the heart base that receives knowledge of all of them.
If one lets go of knowledge of objects of the three times, then all becoming ceases. All these kinds of becoming are brought to an end by seeing the Three Characteristics, for they cut the stream of becoming, thereby causing it to cease. One who practises cannot lose by it, for the Three Characteristics are where Nibbana is to be found.
If one who practises is in doubt as to whether he has attained Nibbana or not, he should look at the Three Characteristics. In the state of Nibbana there is no grasping at anything of any sort, thus it is called the state of Non Self (Anatta).
Prior to the time when the Fruit of the Path (Magga Phala) arises, the Citta of the Sensual Realm connected with Understanding (Kamavacara Nana Sampayutta), arises in the Mind Process (Mano Vithi), cutting the stream of the passive state (Bhavanga), which then ceases. The ceasing of the Passive Citta, means that this state of the Citta changes and that it goes towards another state. In other words, the six sense doors receive knowledge of objects; this being called the arising of the Active Process of the Citta. When the six sense doors stop receiving knowledge, then it is called the Passive State.
Where it is mentioned above, that one should determine the Arising and Ceasing; it means, that to know the Arising, is to know the Active Process of the Citta (Vithi Citta) ; and to know the Ceasing, is to know the Passive State of theCitta. (Bhavanga Citta).
Where it is mentioned above, that the Citta of the Sensual Realm connected with Understanding, arises ; this is the same thing as Wisdom (Panna).
Continually watching the heart base means that one is always fully aware. Whatever arises in the heart base; whether pleasant or unpleasant, whether past, present or future; whether of the Sensual Realm, the Form Realm, or the Formless Realm; all these objects are analogous to the images which are seen on the cinema screen.
The cinema screen is analogous to the heart base, and the heart base does not get free from objects. The Citta of the Sensual Realm connected with Understanding. Which is Wisdom, finds that these states of the Citta are impermanent, and are also suffering. Therefore one should renounce these states, preventing their arising in the Mind Door (Mano Dvara). If, however, they have already arisen, they are impermanent, suffering and non self. Then one may reflect on their impermanence, suffering or non self, but one should choose only one of these for reflection, not all of them. Then one attains the following four states leading to Transcendental Consciousness: