The third purity is Purity of view (ditthi visudhi) This is the stage of insight
that is nama-rupa-pariccheda-nana, the panna that clearly discerns the
difference between the characteristics of nama and rupa. At that moment
one does not take any reality, including the insight knowledge, for self.
There is purity of view, ditthi visuddhi, because there was never before such
clear realisation of the different characteristics of nama and rupa as non-self.