In this book the author gives a clear and simple account of Gurdjieff's teaching on Man and his nature. Anyone who wishes to think for himself and is not afraid to face the truth about his own nature can find his starting point in this book. These lectures by Ouspensky were originally given from 1921 to 1947 and revised for publication by the author himself before his death in 1947. The lectures are indispensable to every serious student of normal and paranormal psychology. Furthermore, they can be studied by any person without scientific training or any prior knowledge of psychology. The lectures enable anyone to find for themselves the basis for self-study and self-development according to the ideas of Gurdjieff.