弘明集 8.63

8.63

釋曰。門者本也。明理之所出入。出入從本而興焉。釋氏有不二法門。老子有眾妙之門。書云。禍福無門。皆是會通之林藪。機妙之淵宅。出家之人得其義矣。喪者滅也。滅塵之勞通神之解。即喪門也。桑當為乘字之誤耳。乘門者。即大乘門也。煩想既滅遇物斯乘故。先云滅門。末云乘門焉。且八萬四千皆稱法門。奚獨喪桑二門哉。

The explanation says: 'Gate' means the root, the place through which radiant principle exits and enters; exit and entry arise from the root. The Śākya teaching has the Non-dual Dharma Gate; Laozi speaks of the Gate of All Wonders; the Book of Documents says 'Misfortune and fortune have no gate.' All these are the groves of comprehensive penetration and the deep abysses of subtle function. A person who leaves home attains this meaning. Sang means extinction: extinguishing the toil of defilements and penetrating spiritual liberation—that is sangmen. Or sang may simply be a scribal error for cheng (vehicle): the 'Vehicle Gate' is the Great Vehicle Gate. When troublesome thoughts are extinguished, whatever one encounters is ridden upon; therefore, first it was called the Gate of Extinction, and later the Vehicle Gate. Moreover, the eighty-four thousand [teachings] are all called Dharma gates; why should there be only the two gates of sang and sang?