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Consciousness is a being the nature of which is to be conscious of the nothingness of its being.

Martin Heidegger, Simone de Beauvoir, Jean-Paul Sartre (2016). “The Philosophical Library Existentialism Collection: Essays in Metaphysics, The Ethics of Ambiguity, and The Philosophy of Existentialism”, p.225, Open Road Media
Consciousness is a being the nature of which is to be conscious of the nothingness of its being.