金剛經纂要刊定記 5.292

5.292

彼即菩提者。釋無虛也。此有三意：一者無色等相處，即顯無相真理是菩提相也。二者即以色等相為菩提相，由色等無性便是菩提，如像無體便是明鏡，即色明空不待滅故，故云彼即菩提相，相即性也。三者菩提無相，却以色等為相，以菩提即真如、真如隨緣成色等故。論云：「無漏無明，皆同真如性相。」

"That is itself bodhi" explains "not unreal." This has three meanings: First, in the absence of characteristics such as form, it reveals that the signless true principle is itself the characteristic of bodhi. Second, the characteristics such as form are themselves taken as the characteristics of bodhi, because the lack of self-nature in form and the rest is itself bodhi—just as an image having no independent entity is itself the bright mirror; revealing emptiness right within form does not wait for its destruction; hence it says that that is itself the characteristic of bodhi, characteristic being identical to nature. Third, bodhi has no characteristics, yet it takes form and the rest as characteristics, because bodhi is tathatā, and tathatā accords with conditions to become form and the rest. The treatise says: "Untaintedness and ignorance are both identical with the nature and characteristics of tathatā."