Sāṃkhya Kārikā verse 5

prati-viṣaya-adhyavasāyaḥ dṛṣṭaṃ trividham-anumānam-ākhyātam |
tat-liṅga-liṅgi-pūrvakam-āpta-śrutiḥ āpta-vacanaṃ tu ||

prati - with regard toviṣaya - objectdṛṣṭa - seenanumāna - inferencetat - that, thisliṅga - manifest, sign, genderpūrva - precedingśruti - hearing , listening; the ear, organ or power of hearing; that which is heard or perceived with the ear; sacred eternal sounds or words as heard by sages, differing from smṛti or what is only remembered and handed down in writing by authorstu - moreover
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Commentaries and Reflections

Commentary by Paul Harvey:

“Direct observation involves selective ascertainment through the senses.
Inference is of three kinds:
– The past shaping the future
– Projecting the whole from the part
– Forming a comparison from a similar.
Authentic authority is trusted words and teachings.”