Sāṃkhya Kārikā verse 5

prati-viṣayādhyavasāyaḥ dṛṣṭaṃ trividham-anumānam-ākhyātam |
tat-liṅga-liṅgi-pūrvakam-āptaśrutiḥ āptavacanaṃ tu ||

dṛṣṭa - seenanumāna - inferencepūrva - preceding

Commentaries and Reflections

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.”