Sāṃkhya Kārikā verse 6

sāmānyataḥ tu dṛṣṭāt-atīndriyāṇāṃ pratītiḥ anumānāt |
tasmāt-api ca-asiddhaṃ parokṣam-āpta-āgamāt-siddham ||

sāmānya - general, generic, not specific, alike, similartu - moreover; butdṛṣṭa - seenatīndriya - Beyond the cognizance (reach) of the sensespratīti - conviction, settled beliefanumāna - inference; the act of inferring or drawing a conclusiontasmāt - from that, on that account, thereforeapi - even, also, although; very; something more; moreoverca - andasiddha - not existing or not having taken effect; imperfect, incomplete, unaccomplished, uneffectedparīkṣā - inspection, investigation, examinationāpta - a credible or authoritative personāgama - testimony; anything handed down and fixed by traditionsiddha - accomplished one; admitted to be true or right, established, settled, proved; a kind of medicinal plant or root

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.