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In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:The Philosophy of the Yogasūtra: An Introduction. Series: Bloomsbury Introductions to World Philosophies by Karen O’Brien-KopChristopher Key Chapple (bio)The Philosophy of the Yogasūtra: An Introduction. Series: Bloomsbury Introductions to World Philosophies. By Karen O’Brien-Kop. London: Bloomsbury Academic, 2023. Pp. xii + 186, Paper $22.95, ISBN 978-135-02-8616-0.This concise book summarizes key parts of the speculative content of Patañjali’s Yogasūtra, leaning heavily on Gerald Larson’s translation of the commentary attributed to Vyāsa. True to its title, this book emphasizes the philosophical arguments regarding ontology and the origins of things. It explains the firm distinction made in Sāṃkhya and Yoga between an unchanging consciousness or Self (ātman/puruṣa) and an ever-changing realm of actions (karma) and substances (dravya) emanating from primordial matter (prakṛti) and expressed through her three modes (guṇa-s) of heaviness (tamas), passion (rajas), and lightness (sattva). This perspective differs radically from other Indian systems as well as from ancient Greek thought and the European Enlightenment tradition that gave way to analytical and continental philosophy.Sāṃkhya and Yoga proclaim that all manifestation arises from a pre-existent cause (sat-kārya-vāda). This position distinguishes these schools from Buddhism, which proclaims the constant rise and fall of constituents of reality (dharma-s), and the various schools of Vedānta, which aver toward a unified view of reality that tends to dismiss the realm of change as ultimately insignificant or even unreal. O’Brien-Kop deftly summarizes various debates on causation. The book mentions the theological nuance that the inclusion of the existence of Īśvara brings to the Yoga table. However, these explorations are more in the realm of theory than practice. For instance, the book neglects the important reference to one’s chosen deity (iṣṭa-devatā, II:44) and leaves unexplored some decidedly theological, religious and devotional implications of the Yogasūtra.The author could have been more careful in explicating Jainism. Statements such as “all forms of action are morally dubious” and that “only death can bring liberation” (p. 60) repeat tropes often heard about Jain thought that echo Hindu and Buddhist critiques. This position overlooks the nuances contained in Umasvati’s Tattvārthasūtra that delineate the Jain 14-fold progression of ascent (guṇasthāna-s) wherein an individual attains a state of freedom while living in the human body at the 13th stage.This book sets the stage for further research into under-explored areas of the Yogasūtra. The rich celebration of the efficacy of ethical comportment in [End Page 1] the second chapter, though competently summarized in O’Brien-Kop’s chapter seven, calls out for further explication. The details regarding the body and the subtle body found in the third chapter of the Yogasūtra receive scant attention. One would hope that in future works the author will engage interlocutors such as Merleau-Ponty and Luce Irigaray on breath and embodiment. O’Brien-Kop’s chapter nine, “The Aesthetics of Freedom” calls into focus the centrality of the enlightenment process through which Buddhi, the bridge between conscious awareness and the material real, reverts increasingly toward sattva, the most refined and hence most liberating state of being. Brief mention is made here of the body’s perfectibility (p. 148). The discussion of metaphor at the end of the chapter invites a more extended conversation about light, jewels, and steadiness. This book advances conversations long in process about the nature and purpose of Yoga. The Yogasūtra was rediscovered in the 19th century and popularized by Swami Vivekananda, whose book Raja Yoga introduced the Yoga tradition to millions worldwide. Scholars such as Dasgupta, Eliade, Feuerstein, Larson, Barbara Stoler Miller, Rukmini, Whicher, Bryant and many others have helped bring rigor to the study of this important text, complementing the many popular translations by Swamis and teachers of modern postural Yoga.The book includes discussion questions at the end of each of the chapters. It is written in a manner accessible to undergraduate students of philosophy. O’Brien-Kop reminds us that the philosophical rigor of the...