大方廣佛華嚴經隨疏演義鈔 73.15

73.15

疏「無所不融故能一身包含無外」者。此金剛藏正用前作住持相中，於其身中示有無量國土莊嚴之事，及於自身示現佛身。

Regarding the Commentary's statement, "Because there is nothing it does not fuse, a single body can encompass [all] without exterior": this is Vajragarbha directly utilizing the aforementioned characteristic of abiding and sustaining, manifesting the immeasurable adornments of Buddha-lands within his body, and manifesting the Buddha's body within his own body.