Study a single sutra by selecting the pada (chapter) and then the sutra (verse).
Source: English translation from Light on the Yoga Sutras of Patanjali (B.K.S. Iyengar)
The ceaseless flow of discriminative knowledge in thought, word and deed destroys ignorance, the source of pain.
Source: How to Know God: The Yoga Aphorisms of Patanjali (Swami Prabhavananda, Christopher Isherwood)
Ignorance is destroyed by awakening to knowledge of the Atman, until no trace of illusion remains.
Source: English translation from The Heart of Yoga (T.K.V. Desikachar)
Essentially the means must be directed toward developing clarity so that the distinction between the changing qualities of what is perceived and the unchanging quality of what perceives becomes evident.