Purification by knowledge and vision of what is the path and what is not the path (Buddhism)

It is first necessary to apply one's self to the inductive insight from contemplation or comprehension of groups, where states are differentiated into past, future and present (overcoming doubt). Having begun insight, knowledge of what is and what is not the path arises during full understanding as investigation.

Imperfection is avoided when the skilful meditator defines and examines illumination or whatever has arisen, understanding that it is impermanent, formed, subject to destruction, fall, fading away, and so on. Or he may see that it is not self being taken as self. Seeing the illumination or whatever has arisen as not mine, not I, not myself, there is no wavering. Seeing them as states that arise on the way but not the path itself, the meditator keeps to the course of insight knowledge, free of imperfections, that is the path.

One of the five purifications or purities which constitute the trunk or body of understanding according to Hinayana Buddhism, the others being: purification or purity of view; purification or purity of overcoming doubt; purification by knowledge and vision of the way or purity of knowledge and discernment of the middle way; purification by knowledge and vision or purity of knowledge and discernment.