Discernment must ultimately understand the nature of self completely. Awareness saw in the Third Foundation how the self was born from a feeling and elaborated on with thought forming the story and image of "I". Even though that process is now understood (wisdom), still, because of its tremendous momentum, there may be a residual belief in the self when it arises. Discernment wears down that residual belief by tracking the sense-of-self through all its manifestations
until there is no longer the belief in self even though there is the occasional arising of self.
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