觀無量壽佛經疏 2.98

2.98

三、言發菩提心者，此明眾生欣心趣大，不可淺發小因。自非廣發弘心，何能得與菩提相會。唯願我身，身同虛空，心齊法界，盡眾生性。我以身業恭敬供養禮拜，迎送來去，運度令盡。又我以口業讚歎說法，皆受我化，言下得道者令盡。又我以意業入定觀察，分身法界，應機而度，無一不盡。我發此願，運運增長猶如虛空，無處不遍，行流無盡徹窮後際，身無疲倦心無厭足。又言菩提者，即是佛果之名。又言心者，即是眾生能求之心。故云發菩提心也。

Third, as for "generating the bodhicitta": this clarifies that when sentient beings aspire to advance toward the Great [Vehicle], they must not generate a shallow, lesser cause. Unless one broadly generates a vast mind, how could one unite with bodhi? [One should vow:] "May my body be equal to empty space, and my mind equal to the dharmadhātu, exhausting the nature of sentient beings. Through physical karma, with respect, offerings, and prostrations, welcoming and seeing off, coming and going, I will convey and deliver them until all are exhausted. Moreover, through verbal karma, praising and preaching the Dharma, may all receive my transformation, and may those who attain the Way upon my words be exhausted. Moreover, through mental karma, entering samādhi and contemplating, dividing my body throughout the dharmadhātu, responding to capacities to save them, may none fail to be exhausted. Having made this vow, may it increase with every thought like empty space, nowhere unpervaded, its flow of practice without end, penetrating to the utmost limit of the future, without bodily weariness and without mental satiety." Furthermore, "bodhi" is the name of the fruit of Buddhahood. Furthermore, "mind" is the mind of sentient beings capable of seeking it. Therefore it is said: "generating the bodhicitta".