This volume is a simple and lucid translation of the Upanishad with explanation and follows Shankaras interpretation. This compilation is based on Swami Lokeswaranandas weekly discourses on the Upanishad.Chandogya Upanishad is the second biggest of the major Upanishads containing sublime flashes of spiritual light and it is an ancient source of principal fundamentals of Vedanta philosophy. It forms the last eight chapters of the Chandogya Brahmana of the Sama Veda. Each of the chapters of the Chandogya Upanishad is important. The first five chapters are about worship and meditation; whereas from the sixth chapter on they are about Brahman. The purpose of the meditation chapters is to emphasize the need for a pure heart. Only when the heart is pure can instructions about Brahman be effective. The Chandogya Upanishad occupies a high place among the extant Upanishads. It's language is simple and it tells many stories but it's subject matter is profound. It takes care of the needs of ordinary people as well as those who are highly intellectual.