The Yoga philosophy of Patanjali is refuted here.
Yoga is an aid to the concentration of mind.
Without concentration one cannot have knowledge of Brahman. Hence Yoga is a means to knowledge. As the Yoga Smriti is based on the Srutis, it is authoritative. The Yoga Smriti acknowledges the Pradhana which is the First Cause. For the same reason as adduced against the Sankhya system, the Yoga philosophy by Patanjali is also refuted as it also accepts the theory that Prakriti is the cause of the universe.