因明入正理論疏 2.84

2.84

成劫之初有外道出，名劫比羅，此云黃赤色仙人，鬚髮面色皆黃赤故。古云迦毘羅仙人，訛也。其後弟子，十八部中上首者，名筏里沙，此名為雨，雨際生故。其雨徒黨名雨眾，梵云僧佉奢薩坦羅，此名數論，謂以智數數度諸法，從數起論，論能生數，復名數論。其學數論及造彼者，名數論師。彼說二十五諦，略為三、中為四、廣為二十五諦。

At the beginning of the cosmic epoch of formation (vivartakalpa), a non-Buddhist appeared named Kapila, which translates as the 'yellow-red rishi,' because his beard, hair, and facial complexion were all yellow-red. The ancient rendering 'Kāpila rishi' was an error. Among his later disciples, the foremost of the eighteen schools was named Varṣa, which means 'rain,' because he was born during the rainy season. That rain-lineage was called the 'Rain Host' (Vārṣagaṇya). In Sanskrit it is Sāṃkhya-śāstra, which here means 'enumeration treatise': that is, using wisdom repeatedly to measure all phenomena, the treatise arises from enumeration, and the treatise can generate enumeration, so it is again called Sāṃkhya. Those who study Sāṃkhya and those who composed it are called Sāṃkhya masters. They teach twenty-five principles (tattvas), which are briefly three, moderately four, and broadly twenty-five principles.