肇論新疏 2.106

2.106

答曰：經云：「般若義者，無名無說、非有非無、非實非虛，虛不失照、照不失虛。」斯則無名之法，故非言所能言也。

Answer: The sūtra says: "The meaning of prajñā is without name and without exposition, neither existent nor non-existent, neither real nor unreal; empty, it does not fail to illuminate; illuminating, it does not fail to be empty." This, then, is a dharma without name; therefore it is not something that words can express.