仁王護國般若經疏 5.32

5.32

「大王如如文字」下，第二明修空。文三：初辨修習。又二：初明因位。因教生智，教為智母。又空如文字、文字如空，故云「如如」。因此如如能生佛智，故云「智母」也。「一切眾生」下，二明果位。在眾生身為佛性，在佛身名一切種智。未成佛時當必得成，當能成故名當為母。未得道時名佛性，已得道時名一切種智也。

From “Great King, tathatā and words and letters” onward is the second part, clarifying the cultivation of emptiness. The text has three: first, discerning cultivation and practice. This also has two: first, clarifying the causal stage. Relying on the teaching, wisdom is generated; the teaching is the mother of wisdom. Furthermore, emptiness is like words and letters, and words and letters are like emptiness; hence it says “tathatā.” Relying on this tathatā, one can generate the Buddha's wisdom; hence it is called the “mother of wisdom.” Second, from “all sentient beings” onward clarifies the fruition stage. In the body of a sentient being it is the buddha-nature; in the body of a buddha it is called sarvākārajñatā. When one has not yet become a buddha, one will certainly attain it; because it will be able to accomplish it, it is called “future mother.” When one has not yet attained the Path, it is called buddha-nature; when one has already attained the Path, it is called sarvākārajñatā.