What are the Yoga Sutras?: The Yoga Sutras of Patanjali succinctly outlines the art and science of Yoga meditation for Self-Realization. It is a process of systematically encountering, examining, and transcending each of the various gross and subtle levels of false identity in the mind field, until the jewel of the true Self comes shining through.

When Patanjali codified, or compiled the Yoga Sutras, it was not that a new system was created, but rather, the ancient practices were summarized in an extremely organized and terse way. While the Yoga Sutras are thought to be as old as 400 BCE, archaeological evidence and other texts suggest that the methods described in the Yoga Sutras were being practiced as early as 3000 BCE. Oral tradition states that the period may be even longer.

via Yoga Sutras.