This book is a compilation of class talks on Yoga delivered by Swami Gnaneswarananda, the founder of the Vivekananda Vedanta Society, Chicago. The Swami explains in a clear and persuasive language the four great paths to God-realisation—Karma Yoga, Bhakti Yoga, Jnana Yoga and Raja Yoga. His concise, lucid and fascinating language, with up-to-date phraseology laced with humour, stories and anecdotes, will help the readers easily comprehend the principles and practices of the four yogas.