Sāṃkhya Kārikā verse 6
sāmānyataḥ tu dṛṣṭāt-atīndriyāṇāṃ pratītiḥ anumānāt |
tasmādapi cā-siddhaṃ parokṣam-āpta-āgamāt-siddham ||
Commentaries and ReflectionsPaul Harvey:
(What about the supersensible?)
But, knowledge of what is beyond the range of the senses is from inference based on generalised correlation; and knowledge not attainable even by that is attained though the eyes of another or authentic texts.