金剛般若經旨贊 1.49

1.49

經。有持戒至以此為實　贊曰。次明有因。於中有四。一久修三學行。二遇佛集妙因。三為佛所攝受。四離障得勝報。由此四因故。能信受。此初因也。言三學者。謂戒定慧。以此三學。備攝諸行。具三學者。知教順理。故具三學。能信此經。以此經為真實稱理。既有信者。亦不空說。故天親論。頌此義云。

Sūtra: “…there will be those who uphold the precepts […] up to: regarding this as true.”
Commentary: Next, he clarifies that there are causes. Within this there are four: first, having long cultivated the practice of the three trainings; second, having encountered Buddhas and accumulated wondrous causes; third, being gathered and sustained by the Buddhas; fourth, having departed from hindrances and obtained superior retributions. Because of these four causes, they are able to faithfully accept it. This is the first cause.

The “three trainings” refers to morality, concentration, and wisdom. Because these three trainings fully encompass all practices, those who possess the three trainings know that the teachings accord with principle; hence, by possessing the three trainings, they can believe in this sūtra and take this sūtra to be true and in accord with principle. Since there are those who believe, it is not spoken in vain. Therefore, Vasubandhu’s treatise states in verse on this meaning: