Here are seven ways to explain this sūtra from seven different, respected, and renowned authorities known for their work with Patañjali’s Yoga Sūtras.
T.K.V. Desikachar: Comprehension is based on direct observation of the object, inference, and reference to reliable authorities.
B.K.S. Iyengar: Correct Knowledge is direct, inferred or proven as factual.
Sri Swami Satchidananda: The sources of right knowledge are direct perception, inference and scriptural testimony.
Chip Hartranft: Right perception arises from direct observation, inference, or the words of others.
Gregor Maehle: Correct perception (pramana) is made up of direct perception, inference, and valid testimony.
Swāmi Hariharānanda Āranya: Perception, inference and testimony constitute the pramanas.
I.K. Taimni: (Facts of) right knowledge (are based on) direct cognition, inference or testimony.
B.K.S. Iyengar: Correct Knowledge is direct, inferred or proven as factual.
Sri Swami Satchidananda: The sources of right knowledge are direct perception, inference and scriptural testimony.
Chip Hartranft: Right perception arises from direct observation, inference, or the words of others.
Gregor Maehle: Correct perception (pramana) is made up of direct perception, inference, and valid testimony.
Swāmi Hariharānanda Āranya: Perception, inference and testimony constitute the pramanas.
I.K. Taimni: (Facts of) right knowledge (are based on) direct cognition, inference or testimony.