摩訶止觀 8.30

8.30

如是體達，名為「無礙道」；「一切無礙人，一道出生死」。云何出耶？有時體達貪欲畢竟清淨，無累無染，猶如虛空，豁出生死，是名「住調伏得益」。或時縱心觀此貪欲本末因緣，幾種是病？幾種是藥？如和須蜜多入離欲際度脫眾生，作是觀時，豁出生死，是名「住不調得益」。或時二俱非故得益；或時俱觀得益。如是善巧應住、不應住，自他俱益，於菩薩法無所損減，以四悉檀而自斟酌。

Penetrating and realizing in this manner is called the "unobstructed path": "All unobstructed people transcend birth and death by the single path." How do they transcend? Sometimes, penetrating and realizing that lust is ultimately pure, free of encumbrance and undefiled like empty space, they suddenly transcend birth and death; this is called "abiding in subduing and gaining benefit." Or at times, giving free rein to the mind, they contemplate the root and branch causes and conditions of this lust—how many kinds are illnesses, and how many kinds are medicines? Just as Vasumitrā entered the limit of detachment to liberate sentient beings, when cultivating this contemplation, they suddenly transcend birth and death; this is called "abiding in non-subduing and gaining benefit." Or at times, because both are negated, they gain benefit; or at times, by contemplating both, they gain benefit. In this way, skillfully adapting to when one should abide and when one should not abide, both oneself and others benefit, with nothing diminished from the bodhisattva's path, deliberating through the four siddhāntas.