摩訶止觀 7.17

7.17

若於無塞、無通起苦、集、無明、障蔽者，非但失於神通，亦失馬、步。能破如所破，字為非字，如彼蟲道偶得三觀之名，是蟲不知是字非字。若於一一法、一一能、一一所，皆即空、即假、即中，具諦緣度，是名無通、無塞，雙照通塞。是為智者識字非字；亦名良醫知得、知失。於無生門明識通塞者，於餘法門亦如是。是為初心過五百由旬，應明六即義（云云）。

If toward no-obstruction and no-opening one gives rise to suffering, origination, avidyā, and veiling hindrances, one will not only lose supernormal powers, but also lose the horse and walking on foot. The subjective breaker is like the object broken; characters become non-characters, just like that track of a worm accidentally forming the name "three contemplations," where the worm does not know whether this is a character or not a character. If in each and every dharma, each and every subjective capacity, and each and every objective realm, all are precisely empty, precisely provisional, and precisely the middle, replete with truths, links, and perfections, this is called no-opening and no-obstruction, illuminating both opening and obstruction. This is the wise person knowing characters and non-characters; it is also called the skilled physician knowing gain and knowing loss. One who clearly recognizes obstruction and opening at the gate of non-arising does so likewise at the other Dharma gates. This is the beginner surpassing five hundred yojanas; the meaning of the six identities should be explained (and so forth).