From the book:

THIS volume of papers, unconnected as they are, it will be better to read through from the beginning, rather than dip into at random. A certain thread of meaning binds them. Memories of childhood and youth, portraits of those who have gone before us in the battle - taken together, they build up a face that "I have loved long since and lost awhile," the face of what was once myself. This has come by accident; I had no design at first to be autobiographical; I was but led away by the charm of beloved memories and by regret for the irrevocable dead; and when my own young face (which is a face of the dead also) began to appear in the well as by a kind of magic, I was the first to be surprised at the occurrence. My grandfather the pious child, my father the idle eager sentimental youth, I have thus unconsciously exposed. Of their descendant, the person of to-day, I wish to keep the secret: not because I love him better, but because, with him, I am still in a business partner-ship, and cannot divide interests.