This book, first published in 1922, examines the science of Râja Yoga. It presents lectures on Yoga, delivered to a western audience view to explaining Indian philosophy; the lectures are accompanied by the Sutras (aphorisms) of Patanjali, along with an explanatory commentary.

This book, first published in 1922, examines the science of Räja Yoga. All the orthodox systems of Indian philosophy point to one goal, the liberation of the soul through perfection - and the method to attain this is through Yoga. This book presents lectures on Yoga, delivered to a western audience view to explaining Indian philosophy; the lectures are accompanied by the Sutras (aphorisms) of Patanjali, along with an explanatory commentary.