說無垢稱經疏 4.116

4.116

贊曰：下難無為。初牒出體、後正申難。此牒出體。空理義云：入者證也。正性者，法之真性，即勝義空性也。應理義云：無生之體，即是所證真如正性，真如乃是法正真性。舊云「正位」，位者體位，即正性也。

The commentary says: The following challenges the unconditioned. First it cites its substance, and later it formally presents the challenge. Here it cites its substance. In terms of the principle of emptiness, 'entering' means realizing. Samyaktvaniyata is the true nature of phenomena, which is ultimate śūnyatā. In terms of the Yuktivāda principle: the substance of non-arising is precisely the realized samyaktvaniyata of tathatā, for tathatā is the truly real nature of phenomena. The older translation called it the 'correct station' (zhengwei); 'station' means the position of substance, which is samyaktvaniyata.