觀無量壽佛經義疏 3.133

3.133

「『若有眾生願生彼國者，發三種心，即便往生。何等為三？一者至誠心、二者深心、三者迴向發願心。具三心者，必生彼國。』」發三心者，菩提心也，亦名無上道心。一至誠者，求佛菩提決定堅固，至佛不移也。二深心者，於大乘法聞思修習，至佛不已也。《釋論》云「智度大海，唯佛窮底」，故云深也。三迴向發願，所修功德普施眾生，至佛無盡。若對三聚，初即攝律儀，無惡不斷，故必至誠；二即攝善法，無善不修，故必漸深；三攝眾生，無生不度，故必迴施。若對三佛，初是斷德，法身佛也；二即智德，報身佛也；三即恩德，應身佛也。果有三佛，因必三心，不可缺一，餘廣如別。二、修三行，二：初、列行相；二、示時限。初、列行相。

"‘If there are sentient beings who wish to be born in that land, by arousing three kinds of mind, they will immediately attain rebirth. What are the three? The first is the most sincere mind; the second is the deep mind; and the third is the mind of dedication and making vows. Those endowed with the three minds will certainly be born in that land.’" Arousing the three minds means the bodhicitta, also called the mind of the unsurpassed path. First, the most sincere mind means that the seeking of the Buddha's bodhi is decisive and firm, unswerving until Buddhahood. Second, the deep mind means hearing, reflecting upon, and cultivating the Mahāyāna Dharma, unceasing until Buddhahood. The Commentary says: "The great sea of prajñāpāramitā can only be fathomed by the Buddha"; hence it is called "deep." Third, the mind of dedication and making vows means universally bestowing the cultivated merit upon sentient beings, inexhaustible until Buddhahood. If correlated with the three collections of precepts: the first is the precept of ethical restraint, abandoning every evil, hence it must be most sincere; the second is the precept of cultivating good dharmas, cultivating every good, hence it must gradually deepen; the third is the precept of benefiting sentient beings, delivering every sentient being, hence one must dedicate and bestow. If correlated with the three Buddhas: the first is the virtue of abandonment, the Dharmakāya Buddha; the second is the virtue of wisdom, the Sambhogakāya Buddha; and the third is the virtue of grace, the Nirmāṇakāya Buddha. As the fruit has three Buddhas, the cause must have three minds, not one of which can be lacking; the rest is explained in detail elsewhere. Second, cultivating the three practices has two [parts]: first, listing the characteristics of the practices; and second, showing the time limit. First, listing the characteristics of the practices.