अनेनैवोपायेन नान्येन इति नियोगः ॥ कZ_०९.७.७४ ॥
anenaivopāyena nānyena iti niyogaḥ
“唯用此法,不用他法”——这就是固定规定(niyoga)。
When the situation has a clear best instrument and deviation increases risk—policy is mandated rather than discretionary.