金剛般若波羅蜜經略疏 2.44

2.44

Regarding the third [part], revealing the depth of the essence of practice, there are three [sections] in the text, which may be understood: First, the response, reward, and transformation bodies have function, [whereas] those dharmakāya Buddhas neither come nor go; hence ordinary persons do not understand. Second, 'Why is this?' is an interrogation. Third, it reveals that the characteristic of the dharmakāya constantly abides thus, unchanging and not different, and is therefore profound. Thus the verse in the treatise says:
'The Buddhas of the transformation body come and go;
The Tathāgata is constantly unmoving.
In this realm of reality (dharmadhātu),
They are neither one nor different.'