The Ishavasya Upanishad is considered to be one of the most authoritative texts of the Vedic scriptures. The proper understanding of this Upanishad is the key to unlock the rest of these scriptures. This text is essential in the study of Hinduism in general and Vedanta in particular, since it teaches the essential unity of God and the universe. Its mysterious and encrypted verses, that may seem contradictory to us, are hard to understand without the proper guidance of a spiritual master. By his commentary, Prabhuji brings light to these ancient teachings, helping the readers to grasp its spiritual essence. This commentary encourages the reader to evaluate the message of the Upanishadic literature from a critical perspective. Prabhuji's teachings are an invitation, words of encouragement that can inspire us to investigate and explore within ourselves. If we are able to observe ourselves free of any interpretation, we will always find an open door.