維摩經玄疏 6.54

6.54

二、明空門者，即是三藏教明折正因緣假實法生滅入空。若稟此教，能破假實之惑，見假實空，發真無漏。因空見真，空即第一義之門也。故須菩提在石室觀生滅無常入空，因空得道，名見佛法身，恐此是《成實論》之所申也。

Second, clarifying the gate of emptiness: this is the Tripiṭaka teaching clarifying the reduction of provisional and real dharmas of correct causes and conditions, their arising and perishing, entering into emptiness. If one receives this teaching, one can destroy the delusions of provisionality and reality, see the emptiness of provisionality and reality, and generate true taintlessness. Because of emptiness one sees the truth; emptiness is the gate to the supreme meaning. Hence Subhūti, in his stone chamber, contemplated arising, perishing, and impermanence, entering emptiness, and attained the path by means of emptiness, which is called seeing the Buddha's dharmakāya. It is feared that this is what is set forth in the Tattvasiddhi Śāstra.