The book "The Yoga-Sutra of Patanjali" by Chip Hartranft is a significant collection of Indian philosophy that succinctly presents the workings of the mind and the path to liberation. Written in the second or third century AD, the Yoga-Sutra serves as a kind of map of human consciousness and offers valuable insights into the mental states that arise during meditation, yoga, and other spiritual practices. It addresses the truths of human existence and illuminates how we acquire knowledge, why we suffer, and how we can find a way out of this suffering. Hartranft's fresh translation and comprehensive, clear commentary bring the text to life and provide additional useful materials, including an afterword on the legacy of the Yoga-Sutra and its relevance to contemporary times.