In the "Science of Being", the Maharishi illustrates the concepts of relative existence as the experience of everyday reality through one's senses, and absolute reality as the origin of being, and the source of all creative intelligence. The Maharishi describes this absolute reality, or Being, as unchanging, omnipresent, and eternal. He also identifies it with bliss consciousness. The two aspects of reality, the relative and the absolute, are like an ocean with many waves. The waves represent the relative, and the ocean beneath is the foundation of everything, or Being. Establishing oneself in the field of Being, or unchanging reality, ensures stability. In his "Science of Being" the Maharishi introduced an additional concept: that of fulfillment viewed as something to be obtained not through exertion or self effort, but through the progressive settling of the mind during the practice of TM. This was the first full systematic description of the principles underlying the Maharishi's teachings. In his 1967 publication, "Bhagavad-Gita: A New Translation and Commentary", the Maharishi describes the Bhagavad Gita as "the Scripture of Yoga". He says that "its purpose is to explain in theory and practice all that is needed to raise the consciousness of man to the highest possible level." According to Peter Russell, the Bhagavad-Gita deals with the concept of loss of knowledge and subsequent revival, and this is brought out by the Maharishi himself in the introduction. In the Preface, the Maharishi writes: "The purpose of this commentary is to restore the fundamental truths of the Bhagavad-Gita and thus restore the significance of its teaching. If this teaching is followed, effectiveness in life will be achieved, men will be fulfilled on all levels and the historical need of the age will be fulfilled also." A second concept, that of freedom, presented as the antithesis of fear, is also prevalent in the book, according to Jack Forem. Forem states that in his interpretation of the Gita, the Maharishi expressed several times that as man gains greater awareness through the practice of Transcendental Meditation, he gradually establishes a level of contentment which remain increasingly grounded within him and in which the mind does not waver and is not affected by either attachment or fear. The Maharishi was reported to be a vegetarian, an entrepreneur, a monk and "a spiritual man who sought a world stage from which to espouse the joys of inner happiness". He was described as an abstemious man with tremendous energy who took a weekly day of silence while sleeping only two hours per night.