金剛經纂要刊定記 7.100

7.100

若智等者。明此三種體即是智，但依止方便不同，故立三名也。奢摩他此云止，止即是定，智依此定併息萬緣，唯心獨存故云知也。

Regarding "If wisdom..." and so forth: this clarifies that the essence of these three is wisdom itself, but because the skillful means on which they rely differ, three names are established. Śamatha here means calm abiding; calm abiding is samādhi. When wisdom relies on this samādhi, it completely calms the myriad conditions, so that mind alone exists; thus it is called "knowing."