We lose track of everything, and of everyone, even ourselves. The facts of my father's life are less known to me than those of the life of Hadrian. My own existence, if I had to write of it, would be reconstructed by me from externals, laboriously, as if it were the life of someone else: I should have to turn to letters, and to the recollections of others, in order to clarify such uncertain memories. What is ever left but crumbled walls, or masses of shade?