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"The Yoga Sutras of Patanjali are in themselves exceedingly brief, less than ten pages of large type in the original. Yet they contain the essence of practical wisdom, set forth in admirable order and detail. ... "Patanjali has in mind the spiritual man, to be born from the psychical.
Compiled in the second or third century CE, the Yoga-Sutra is a road map of human consciousness—and a particularly helpful guide to the mind states one encounters in meditation, yoga, and other spiritual practices.