俱舍論頌疏論本 27.56

27.56

名義言說道，無退智為性者，出體也。謂無退智緣能詮名，名法無礙解。名、句、文三總說為名。此名、句、文持所說義，及生物解，故說名為法。又無退智緣所詮義，名義無礙解。又無退智緣方言詞，立為詞無礙解。又無退智緣契正理，無滯言說，及緣自在定、慧二道，名辯無礙解，無滯言說名之為辯，定慧二道能起辯說，道是辯因，故亦名辯，是利根故，名無退智。智緣名等決斷無礙，名無礙解，故四無礙以無退智為體也。

Regarding 'having names, meanings, speech, and the path as objects, they have non-retrogressing cognition as their nature', this defines their intrinsic natures. When a non-retrogressing cognition takes expressor names as its object, it is called 'unimpeded knowledge regarding teachings'. Names, phrases, and syllables are collectively called 'names'. These names, phrases, and syllables maintain the expressed meaning and give rise to understanding in beings; therefore, they are called 'teachings' (dharma). Furthermore, when a non-retrogressing cognition takes the expressed meaning as its object, it is called 'unimpeded knowledge regarding meanings'. Furthermore, when a non-retrogressing cognition takes regional expressions as its object, it is established as 'unimpeded knowledge regarding expressions'. Furthermore, when a non-retrogressing cognition takes unobstructed speech that accords with correct principles as its object, as well as the two paths of sovereign concentration and wisdom, it is called 'unimpeded knowledge regarding eloquence'. Unobstructed speech is called 'eloquence'; the two paths of concentration and wisdom are able to give rise to eloquent speech, and since the path is the cause of eloquence, it is also called 'eloquence'. Because it belongs to those of sharp faculties, it is called 'non-retrogressing cognition'. Because cognition observes names and so forth with decisive lack of impediment, it is called 'unimpeded knowledge'. Therefore, the four unimpeded knowledges have non-retrogressing cognition as their nature.