Study a single sutra by selecting the pada (chapter) and then the sutra (verse).
Source: English translation from The Yoga Sutras of Patanjali (Sri Swami Satchidananda)
Egoism is the identification, as it were, of the power of the Seer (Purusha) with that of the instrument of seeing [body-mind].
Source: English translation of the Yoga Sutras of Patanjali (Swami Jnaneshvara Bharati)
The coloring (klesha) of I-ness or egoism (asmita), which arises from the ignorance, occurs due to the mistake of taking the intellect (buddhi, which knows, decides, judges, and discriminates) to itself be pure consciousness (purusha).