大乘義章 16.46

16.46

次辨四懃。五門分別：一釋其名、二定體性、三分別行、四論先後、五廣辨相。名字如何？言正懃者，策修不惰，名之為懃；懃心不邪，說以為正。問曰：何故念處及根力等皆不言正，此獨論之？龍樹釋言「精進發動，喜入邪中，為防彼過，故偏論正，以此正懃多發動故。」如諸外道，多皆策懃而隨邪倒，翻離彼過說為正矣（此一門竟）。

Next is to distinguish the four right exertions. Distinguishing them into five sections: first, explaining their names; second, determining their essential nature; third, distinguishing their practices; fourth, discussing their order; fifth, elaborating their characteristics. What are their names? As for "right exertion", spurring oneself in cultivation without indolence is called "exertion"; an exerted mind that is not deviant is said to be "right". Question: Why do the applications of mindfulness, faculties, powers, and so forth not speak of "right", yet this one alone discusses it? Nāgārjuna explains: "When vigor is aroused, it easily enters into deviance; to guard against that fault, it specifically discusses 'right', because this right exertion is frequently stirred into motion." Like the various non-Buddhists who mostly spur themselves with exertion yet follow deviant inversions, reversing and leaving behind that fault is called "right" (this concludes the first section).