This book contains a judicious selection of Indian texts which focus on shabd/nad yoga, which is ancient practice of listening to subtler and subtler sounds within meditation to access higher states of consciousness. Included are portions of various Upanishads, including the Nada Bindu Upanishad, Sandilya Upanishad, and several others. Starts with a portion of the famous Hatha Yoga Pradipika. Begins with an introduction from Professor David Christopher Lane, Ph.D. about modern shabd yoga and its simplified technique.