OM

“Never during its pilgrimage is the human spirit completely adrift and alone. From start to finish its nucleus is the Atman, the god-within... underlying its whirlpool of transient feelings, emotions, and delusions is the self-luminous, abiding point of the transpersonal god. As the sun lights the world even when cloud-covered, “the Immutable is never seen but is the Witness; it is never heard but is the Hearer; it is never thought but is the Thinker; it is never known but is the Knower. There is no other witness but This, no other knower but This." from the Upanishad”
― Huston Smith, The World's Religions: Our Great Wisdom Traditions

“Om is the things, Om is the ingredient, Om is the container and the content of this universe.”
― Banani Ray, Glory of OM: A Journey to Self-Realization