What is truly meant by consciousness, or what is the principle back of that term? The word consciousness from the derivative meaning would signify: to know together. We use the term generally in the sense of being conscious of a fact. That is, consciousness means knowing an object, as it were; knowing something. But the word consciousness really indicates two things—subject and object. It implies the duality of existence. There is one who is the knower, the subject, the ego, the perceiver. I know it; I am conscious of it; I perceive it; I think about it. Therefore there is always the subject, the ego—I—as the background of any form of consciousness.