勸發菩提心集 3.102

3.102

Third, which refers to the threefold pure precepts, difficult precepts (duṣkaraśīla) briefly has three kinds: first, that bodhisattvas currently endowed with great wealth and superior lineage are able to abandon them and receive and uphold the pure precepts of a bodhisattva is called the first difficulty. If, encountering acute distress or even losing one's life, one still does not commit the slightest breach of the precepts received, much less completely violate them, this is called the second difficulty. Pervading all movements, postures, and mental activities, constantly abiding in correct mindfulness, always free from negligence, and even until the end of life committing no minor offense by mistake, much less a major offense, this is called the third difficulty.