金剛般若經疏論纂要 2.163

2.163

即隨形好也，如鏡中無物方能現物，故論云：「法身畢竟非色身、非諸相，然相好二種亦非不佛，此二不離法身故。是故此二亦得言無，故說非身；亦得言有，故說成就。」

This refers to the minor signs. Just as when a mirror is empty of objects it can then manifest objects, the commentary therefore says: "The dharmakāya is ultimately not a physical body, nor is it the marks; yet the two kinds, marks and signs, are also not non-Buddha, because these two are not separate from the dharmakāya. Therefore these two can also be said to be non-existent, and thus it speaks of 'not a body'; they can also be said to be existent, and thus it speaks of 'accomplishment'."