Sāṃkhya Kārikā verse 6

sāmānyataḥ tu dṛṣṭāt-atīndriyāṇāṃ pratītiḥ anumānāt |
tasmādapi cā-siddhaṃ parokṣam-āpta-āgamāt-siddham ||

dṛṣṭa - seenindriya - faculty of sense; sense; organ of senseanumāna - inferencesiddhi - accomplishment, performance, fulfilment, attainment, successāgama - testimony; anything handed down and fixed by tradition

Commentaries and Reflections

Commentary by Paul 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.