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.