大方廣佛華嚴經隨疏演義鈔 6.32

6.32

疏「涅槃亦說佛性亦名般若」者，第二顯正破。上即現量，此即聖言量。般若既即佛性，佛性是常，般若常矣。

Regarding the commentary's "The Nirvāṇa [Sūtra] also says that buddha-nature is also named prajñā," this is the second part: a refutation by revealing the correct [view]. The preceding was direct perception; this is scriptural testimony. Since prajñā is itself buddha-nature, and buddha-nature is permanent, prajñā is permanent.