大乘起信論廣釋卷第三．四．五 5.12

5.12

論。云何為三至眾生苦故　釋曰。此依標顯相也。言直心者。無別義。正觀真如無邪念故。即是二利行之本也。言深心者。是意樂義。意樂修行諸善行故。即是自利行之本也。言大悲者。是普濟□拔眾生苦故。即是利他行之本也。此三即是三聚淨戒三菩提心三種迴向三德三身之因行也。此是其發心相耳。

Treatise: What are the three? [...] because of sentient beings' suffering.
Commentary: This explains the marks according to the stated [number]. Speaking of the "straight mind": It has no other meaning; it is the correct contemplation of tathatā without erroneous thoughts. That is, it is the root of the practice of benefiting both self and others. Speaking of the "deep mind": It has the meaning of aspiration; because one aspires to cultivate all wholesome practices, it is the root of the practice of benefiting oneself. Speaking of "great compassion": It is universally rescuing and pulling [sentient beings] out of their suffering; it is the root of the practice of benefiting others. These three are the causal practices of the three pure moral codes, the three bodhi-minds, the three kinds of dedication, the three virtues, and the three bodies. These are the characteristics of resolving the mind.