The past is always a collection of memories, very precarious memories, because they are never real. On this subject I heard Borges himself say something very beautiful and moving.
I heard Borges say he remembered one evening his father had told him something very sad about memory, he'd said: "I thought I could remember my childhood when I first arrived in Buenos Aires, but now I know I can't, because I think if I remember something, for example, if today I remember something from this morning, I get an image of what I saw this morning. But if tonight I remember that thing from this morning, then what I remember is not the first image I had of that thing, but the first remembered image. And so each time I remember something, I am not really remembering it, but rather I am remembering the last time I remembered it, I am remembering the last memory. So in reality I have absolutely no memories or images of my childhood, of my youth."