金剛般若波羅蜜經註解 1.206

1.206

何以故者，徵起之辭也。由前云：「實無有法得菩提果，故受然燈之記。」遂疑既無佛果，豈有佛法耶？釋云：「如來者，即諸法如義。」如者，真如也，不偽曰真、不異曰如。此真如體貫徹三世，綿亘十方，非空、非有，不變、不遷，名如來性，若有所得即非佛菩提也。

"Why is this?" is an expression introducing inquiry. From the previous statement: "In reality there is no dharma attained in the fruit of bodhi, and therefore he received the prediction from Dīpaṃkara," one might doubt: since there is no fruit of Buddhahood, how could there be Buddha Dharmas? It explains: "'Tathāgata' means the suchness of all dharmas." "Suchness" is tathatā: not false is called true (zhen); not differentiated is called such (ru). This substance of tathatā penetrates the three times and extends through the ten directions; it is neither empty nor existent, neither changing nor shifting, and is named the Tathāgata-nature. If there were anything attained, it would not be the Buddha's bodhi.