法苑珠林 11.53

11.53

答曰。此如外道聲聞變化耳。如佛變化無量三昧力不可思議。是故佛自語時。無量千萬億化佛亦一時皆語。又語外道及聲聞。化不能作化。如佛世尊化復作化。故諸外道聲聞。滅後不能留化。如佛滅後能留化如佛無異。如毘曇中。一時無二心者。今佛亦如是。當化語時。亦不有心。佛心念化。欲令化語。即便皆語。

The answer states: This applies only to the emanations of non-Buddhists and śrāvakas. In the case of the Buddha's emanations, the power of his immeasurable samādhis is inconceivable. Therefore, when the Buddha himself speaks, immeasurable thousands of myriads of koṭis of emanation Buddhas also speak simultaneously. Furthermore, regarding non-Buddhists and śrāvakas, an emanation cannot produce another emanation. But with the Buddha, the World-Honoured One, an emanation can in turn produce another emanation. Hence, after the decease of those non-Buddhists and śrāvakas, they cannot leave emanations behind; whereas after the Buddha's nirvāṇa, he can leave emanations behind, no different from the Buddha himself. As for the statement in the Abhidharma that 'two minds cannot exist simultaneously,' it is also thus with the Buddha now: when an emanation speaks, it also does not possess a mind of its own; it is the Buddha's mind that thinks of the emanation, wishing to make the emanation speak, and thereupon they all speak.