 साक्षी or शाक्षी means 'observer', 'eyewitness' or the 'Supreme Being', is the Atman, the unchangeable eternal Reality, Pure Consciousness and knowledge.It is the timeless Being which witnesses all this ceaseless flow and change in the world of thought and things, the 'Witness' or the higher 'Ego', the faculty which perceives the individual personality.It lends its shine ("Chitchhaya") to the "ego" part of the subtle body, which consists of the everchanging Mind, the decision making Intellect, the Memory & the Illusory Ego.