首楞嚴義疏注經 10.160

10.160

孽，災也。想陰未盡猶引外魔，今想陰盡行陰明露，但於所覺境界別生異見，執此為是，故云心魔。故令覺察善能消息，不失正見，能至無上，故深付囑，傳而示之，俾修行者無入邪網，失正覺路。枝歧，邪道也。

"Calamity" (nie) means disaster. When the aggregate of perception was not yet exhausted, it still invited external māras; now, with the aggregate of perception exhausted, the aggregate of formations is clearly exposed; but concerning the states perceived, he gives rise to distinct, deviant views and clings to these as correct; hence they are called "māras of the mind". Therefore, causing them to awaken and investigate, skillfully calming [these errors], they do not lose correct view and can reach the unexcelled; hence [the Buddha] deeply entrusts it, to transmit and display it, so that practitioners will not enter the net of deviance and lose the path to correct awakening. "Forks in the road" means deviant paths.