The Seven Purifications

The Roots of Insight (Vipassana)

1. Purity of Conduct.
2. Purity of Mind is the mind without the Five Hindrances.

The Body of Insight (Vipassana)

[Preliminary Insight (Anupassana)]
3. Purity of View is the realization of the Three Characteristics that is seeing mind and matter as impermanent, suffering and non-self.
4. Purity of Transcending Doubt is the overcoming of doubt in the causes and conditions of mind and matter.
5. Purity of Knowledge and Vision of What Is Path and Not Path is abandoning the defilements associated with Vipassana after seeing the Three Characteristics and the rise and fall of mind and matter, and gaining Knowledge of Dissolution.

[Supra-mundane Vipassana (Lokuttara-vipassana)]
6. Purity of Knowledge and Vision of the Course of Practice is developing further Knowledge of Deliverance (Muñcitukamyatañana), Knowledge of Contemplation of Reflections (Patisankhañana), Knowledge of Equanimity about Conditioned Things (Sankharupekkhañana) and Knowledge of Conformation with Truth (Saccanulomañana).
7. Purity of Knowledge and Vision is entering Nirvana when contemplating Conformity with Truth, Gotrabhuñana has Nirvana as object and realizes the Four Noble Truths in each of  the three insight knowledge states: knowing the Truths (Sacca-ñana), knowing the functions to perform (Kicca-ñana) and knowing what has been done (Kata-ñana). In these twelve steps mentioned earlier, the meditator permanently destroys ignorance, defilements, craving, clinging and at least the three Fetters of Self Concept, Doubt and Adherence to Useless Precepts and Rituals. The resultant mind, then, takes Nirvana as object and enters Nirvana as Fruit Attainment.

The Purity of View, Purity of Transcending Doubt and Purity of Knowledge and Vision of What Is Path and What Is Not Path including the knowledge associated with these Purifications [Knowledge of Arising and Passing Away, Knowledge of Dissolution, Knowledge of Terror, Knowledge of Danger, Knowledge of Disenchantment] are classed as Preliminary Insight (Anupassana) which lead to the Insight Wisdom (Vipassana-pañña) that all conditioned phenomena are impermanent, suffering and non-self. This is the basis for developing Supra-mundane wisdom (Lokuttara-pañña) which will come later.

Purity of Knowledge and Vision of the Course of Practice and Purity of Knowledge and Vision [including associated insight knowledge] are classed as Supra-mundane Insight leading towards Supra-mundane wisdom (Lokuttara-pañña) which penetrates the Four Noble Truths and Nirvana, they are:

1. Supra-mundane Wisdom penetrates the Four Noble Truths. The Truths of Suffering, the Causes of Suffering and the Path dealing with conditioned phenomena, but the Truth of the Cessation of Suffering deals with the unconditioned. Each Truth has three characteristics, therefore, there are twelve characteristics altogether). The Four Truths are realized in three knowledge states: Knowledge of the Truths as they really are, Knowledge of the Function to be performed regarding each of Four Noble Truths, and Knowledge of what has been done. Lord Buddha declared this in the Dhammacakkappavattana Sutta that altogether there are twelve states .
2. Supra-mundane Wisdom penetrates the unconditioned (Visakhara). The unconditioned is the Nirvana element (Nibbana-dhatu) which exists eternally in the ultimate. It includes the state of Nirvana, the dhamma element that holds the state of Nirvana (Nibbana-dhatu) and Ayatana Nirvana or dwelling place of the Nirvana element. These are unconditioned and have the characteristics of the unconditioned: No arising, No passing away, and when standing not being subject to change. Also, Nirvana is permanent (Niccam), ultimate happiness (Param Sukam) and eternal (Dhuvam). It has the characteristic of self (Atta) that is the opposite of non-self (Anatta). This can be realized by Knowledge of Reflection, examining path, fruit, abandoned defilements, remaining defilements and Nirvana [one of the sixteenth Insight Knowledge].