13. Gottarabhu-nana (Purity of the knowledge and vision of the way of progress)
This is the wisdom that occurs in maggavitthi, which is the path of the citta that goes to Magga-nana (the 14th yana). This yana is different from other yanas in that, while nibbana is the object (supramundane), the mind (citta) is still mundane. Rupa and nama have been abandoned, but it is not completely supramundane yet (lokkuttara). In the previous yana, both mind and object are mundane.
The wisdom of the citta (mind) in this yana changes the yogi from puttujjana (worldling) to ariya-pugghala (noble one). It is the first citta in samsara-vata to have nibbana as an object. Even though nibbana is the object, this yana cannot destroy kilesa completely (samuched).
Aachan Naeb said that this yana is like a new worker, who isn’t completely familiar with his job yet – and that is why this yana cannot destroy kilesa completely