first source of knowledge, pratyakṣa, sense perception. Pratyakṣa requires that one actually see the fire… there must always be an absolute and invariable relationship between the thing inferred, say, the fire, and the reason on which the inference is made
Bryant identifies pratyaksha — direct sense perception — as the primary epistemic source in Patanjali’s system, distinguishing it from inference and testimony by its requirement of immediate, unmediated contact with the object.
, The Yoga Sutras of Patanjali: A New Edition, Translation, and Commentary, 2009thesis