Last and First Men: A Story of the Near and Far Future
Last and First Men: A Story of the Near and Far Future is a book by Olaf Stapledon.
From the Preface
"I have tried to invent a story which may seem a possible, or at least not wholly impossible, account of the future of man; and I have tried to make that story relevant to the change that is taking place today in man's outlook. To romance of the future may seem to be indulgence in ungoverned speculation for the sake of the marvellous. Yet controlled imagination in this sphere can be a very valuable exercise for minds bewildered about the present and its potentialities. Today we should welcome, and even study, every serious attempt to envisage the future of our race; not merely in order to grasp the very diverse and often tragic possibilities that confront us, but also that we may familiarize ourselves with the certainty that many of our most cherished ideals would seem puerile to more developed minds. To romance of the far future, then, is to attempt to see the human race in its cosmic setting, and to mould our hearts to entertain new values."