瑜伽論記 21.378

21.378

不顯名者其義難了，如達羅弭茶明呪等者，則是長年生處，昔有仙人名達羅弭茶，國從其名，名達羅弭茶國。今明彼仙所說明呪，其義難解，凡是呪文悉皆難解，且舉此一，故云達羅弭茶明呪，此明同國呪名難了，不望異國，故與第四對異。

With 'unmanifest names,' their meaning is difficult to understand: 'such as Drāviḍa spells and mantras,' which refers to the birthplace of the long-lived. Long ago there was a seer named Drāviḍa; the country took its name from him and was called Drāviḍa country. Now it clarifies that the spells spoken by that seer are difficult to understand in their meaning. Generally speaking, all mantra texts are difficult to understand; this one is cited as an example, hence it says 'Drāviḍa spells.' This clarifies that mantra names within the same country are difficult to understand, not in reference to foreign countries; therefore it is distinct from the fourth pair.