It is difficult to determine the origin of the contemporary notion of authenticity. Writers on the subject of authenticity have often attempted to ground their views in work from a wide variety of historical periods. Secular and religious notions of authenticity have coexisted for centuries under different guises; perhaps the earliest account of authenticity that remains popular is Socrates' admonition that "the unexamined life is not worth living". In philosophy of art, "authenticity" describes the perception of art as faithful to the artist's self, rather than conforming to external values such as historical tradition, or commercial worth. A common definition of "Authenticity" in psychology refers to the attempt to live one's life according to the needs of one's inner being, rather than