It was the ancient Greeks who in lyric poetry were the first really to discover what we know today and take for granted as the self. It is difficult for us now to imagine how that discovery must have felt like a great revelation.
Social and Behavioral Sciences
Abad, Gemino, "Early Greek Lyric Poetry: The Cry of the Self" (2003). Research Collection School of Social Sciences (Open Access). Paper 15.
Available at: http://ink.library.smu.edu.sg/soss_research/15