Sarvadarshanasangraha 12.45

12.45

ata eva nāgamabalāt tatsādhanam/ yathā tena proktam iti pāṇinyanuśāsane jāgraty api kāṭhakakālāpataittirīyam ityādisamākhyādhyayanasaṃpradāyapravartakaviṣayatvenopapadyate tadvad atrāpi saṃpradāyapravartakaviṣayatvenāpy upapadyate/

Hence (b.) we also maintain that your position cannot be established by any supposed supernatural testimony [as that quoted above from the Rig-Veda, "from him sprang the Ṛch and Sāman verses"]. For the rule of Pāṇini (iv. 3, 101) will still remain inviolate, that the grammatical affixes with which such names as Kāṭhaka, Kālāpa, and Taittirīya are formed, impart to those derivatives the sense of "uttered by" Kaṭha, Kalāpin, &c., though we maintain that these names have reference [not to those parts of the Veda as first composed by these sages, but] to the fact that these sages instituted certain schools of traditional study. And in the same way we hold [in reference to this verse from the Rig-Veda] that it only refers to the institution of certain schools of traditional study of these Vedas.