起信論疏筆削記 19.31

19.31

辨魔事者，梵語魔羅，此云殺者，謂能奪行人功德之財，殺智慧之命。言事以，如佛以功德智慧度眾生，令入涅槃為事。魔不如是，常以破壞眾生善根，令流轉生死為事，以魔樂生死故。三界群品盡屬於魔，今修行之人志欲出離三界，又發弘誓，廣度眾生，魔懼減少眷屬，故來撓之，令其退墮，行人要須辨識而降伏之。然有四種之異：一煩惱魔、二蘊魔、三死魔、四鬼神魔。前三在內，以內修伏之；鬼魔在外，故今甄辨。

Regarding the discernment of demonic events: The Sanskrit term is Māra, translated here as "the killer," meaning that it can rob the practitioner of the wealth of merit and slay the life of wisdom. As for "events": just as the Buddha takes liberating sentient beings through merit and wisdom and causing them to enter nirvāṇa as his work, Māra does not do so, but constantly takes destroying sentient beings' roots of goodness and causing them to transmigrate in saṃsāra as his work, because Māra delights in saṃsāra. The various classes of beings in the three realms all belong to Māra. Now, when a practitioner aspires to escape the three realms and further makes the vast vow to extensively liberate sentient beings, Māra fears that his retinue will decrease; therefore, he comes to harass them to make them regress and fall away. The practitioner must discern and subdue them. However, there are four different kinds: first, the kleśa-māra; second, the skandha-māra; third, the mṛtyu-māra; and fourth, the devaputra-māra (ghosts and spirits). The first three are internal and are subdued by internal cultivation; demonic ghosts are external, and thus are now distinguished and discerned here.