觀無量壽佛經疏 3.179

3.179

六、從阿彌陀下，至丈六八尺已來，正明能觀所觀佛像雖身有大小，明皆是真。即有其三。一明彌陀身通無礙，隨意遍周。言如意者，有二種：一者如眾生意，隨彼心念皆應度之。二者如彌陀之意，五眼圓照六通自在。觀機可度者，一念之中無前無後，身心等赴三輪開悟，各益不同也。二明或現大身或現小身。三明身量雖有大小，皆作真金之色，此即定其邪正也。

Sixth, from “Amitābha” down to “sixteen feet or eight feet,” it directly explains that although the Buddha images of the contemplator and the contemplated differ in bodily size, it is clear that all are the true [Buddha]. Herein there are three [points]: first, explaining that Amitābha’s body is unimpeded in spiritual penetration, pervading everywhere as he wishes. Saying “as he wishes” has two kinds: first, according to the wishes of sentient beings, responding to and saving them in accordance with their mental thoughts; second, according to Amitābha’s wish, his five eyes illuminating perfectly and his six abhijñās being sovereign. Observing faculties that can be saved, in a single thought-moment without prior or posterior, body and mind equally respond, opening enlightenment through the three wheels, each benefit being different. Second, explaining that he manifests either a large body or a small body. Third, explaining that although the bodily measure may be large or small, all are the color of true gold; this determines the correct from the incorrect.