In yoga sutra 1.2, the second sutra of book one, Patanjali lays out the definition and purpose of yoga. Yogas citta vrtti nirodhah: yoga is the cessation of the modifications, or fluctuations, of the mind. This sutra gets right to the heart of why we practice yoga.

Exploring the Yoga Sutras of Patanjali: Sutra 1.2
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