Mental
Purification comes in Seven Stages!

1: Mental Purification by Morality.
2: Mental Purification by Meditation.
3: Mental Purification by
Right View.
4: Mental Purification by overcoming Doubt.
5: Purification by
Knowledge and Vision of what is Path & Non-Path.
6: Purification by
Knowledge and Vision of the Noble 8-fold Way.
7: Purification by
Directly Experienced Knowledge
and Vision.

6-WORD EXACT
Avoiding all Harm;
Doing only Good;
Purifying the Mind;
This do all Buddhas teach!
Dhammapada 183
More on
Mental Purification (Visuddhi):
Mental_Purity,
Levels
of Leaving Behind,
The_purpose_of_purification,
Ability_Purification,
The_8_Understandings,
Immaculate_Integrity.