瑜伽師地論略纂 8.173

8.173

論解婆羅門中云「名想婆羅門」者，謂諸世間由想、等想，假立言說，名婆羅門者，此中有釋，如剎帝利，父母為立假號婆羅門，體是剎帝利，想號婆羅門故。又「由想」者，謂名；「等想」者，謂諸世間等，同此想號婆羅門。下第三、真善婆羅門也。婆羅門名真淨者，淨其意志故，如前已釋。

In explaining brāhmaṇas, the treatise says: "Nominal and conceptual brāhmaṇas: that is, all worldly people, by way of concept and conventional concept, provisionally establish conventional designation and call them brāhmaṇas." Here there is an explanation: just as with a kṣatriya whose parents establish for him the provisional title of brāhmaṇa, whose substance is kṣatriya, but by concept he is titled brāhmaṇa. Furthermore, "by concept" refers to the name; "conventional concept" refers to all the world equally sharing this conceptual title of brāhmaṇa. Below is the third, the true and good brāhmaṇa. A brāhmaṇa is called truly pure because they purify their intentional will, as explained previously.