金剛經纂要刊定記 5.110

5.110

為離等者。恐聞實相之名，便生實相之想。想即分別也。良以實相真妙言念不及，雖假言念唯證相應。若起當情但唯影像，恐認於此故曰即非。

"In order to be free..." means: it was feared that hearing the name of dharmatā, one would form a conception of dharmatā. Conception is conceptualization (vikalpa). Because dharmatā is truly wondrous, beyond words and thoughts, although words and thoughts are used provisionally, it corresponds only to direct realization. If one generates [a concept] within the mind, it is merely an image; fearing that one would mistake this for it, it says "is not."