P. D. Ouspensky's unique series of five 'psychological lectures' describe not what Humanity is now, but what it may become. In these lectures, originally meant only for a select few, Ouspensky gives invaluable guidance for those starting out on this most important of all quests. P. D. Ouspensky describes how a man must work simultaneously on his knowledge and his being to find inner unity and why although his development depends on his own efforts, this is very difficult to achieve without guidance from a School.