"It is I"

"In the beginning, this (universe)was the self alone, in the shape of a person. He reflected and saw nothing else but his self. He first said, "I am he". Therefore, he came to be known by the name "I (Aham)". hence, even now when a person is addressed, he first says, "it is I", and then says whatever other name he may have.

-----Brihdranyaha Upanishad.