瑜伽師地論略纂 11.45

11.45

論云「又一如來於一三千大千佛土普能施作佛事，是故第二如來出世無所利益」者，此解一界無二佛意也。　問曰：如一佛神力無邊，能盡十方，並能饒益，豈以此之神力而十方佛不出世耶？何故乃言一三千界無二佛出？義曰：不然。佛神力雖復無邊，且約相言一三千界而施佛事，故一佛世界無有二如來。有出量，故唯三千界，非餘十方。

Regarding the treatise's statement, "Furthermore, a single Tathāgata is universally capable of performing Buddha-activities in a single great trichiliocosm; therefore, the appearance of a second Tathāgata in the world would be of no benefit": this explains the intention behind there not being two Buddhas in a single world. Question: If a single Buddha's supernatural power is boundless, capable of reaching throughout the ten directions and benefiting all, could it be that by this supernatural power the Buddhas of the ten directions do not appear in the world? Why then say that two Buddhas do not appear in a single trichiliocosm? The doctrinal explanation is: It is not so. Although a Buddha's supernatural power is boundless, provisionally speaking from the perspective of external marks, he performs Buddha-activities in a single trichiliocosm; therefore, in a single buddha-world there are no two Tathāgatas. There is a measure for appearance; hence it is only a trichiliocosm, not the rest of the ten directions.