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 cause of pain is the association or identification of the seer (atma) with the seen (prakrti) and the remedy lies in their dissociation.
Source: How to Know God: The Yoga Aphorisms of Patanjali (Swami Prabhavananda, Christopher Isherwood)
This pain is caused by false identification of the experiencer with the object of experience. It may be avoided.
Source: English translation of the Yoga Sutras of Patanjali (Swami Jnaneshvara Bharati)
The uniting of the seer (the subject, or experiencer) with the seen (the object, or that which is experienced) is the cause or connection to be avoided.