金剛經纂要刊定記 4.253

4.253

無分別者。即無為義。無所作為故云無為。無為、真如蓋是一法。

[On] "nirvikalpa": this is the meaning of asaṃskṛta. Having nothing to do or produce, it is called asaṃskṛta. Asaṃskṛta and tathatā are essentially a single dharma.