Susan Sontag on the Literary Journal

A writer's journal must not be judged by the standards of a diary. The notebooks of a writer have a very special function: in them he builds up, piece by piece, the identity of a writer to himself. Typically, writers' notebooks are crammed with statements about the will: the will to write, the will to love, the will to renounce love, the will to go on living. The journal is where a writer is heroic to himself. In it he exists solely as a perceiving, suffering, struggling being. [Journals are byproducts of narcissism.]

Susan Sontag, Against Interpretation, 1969