This book suggests that religion, in its usual sense, can be replaced by something better, that the human spirit or subjectivity can be the subject of scientific study and that lack of purpose or design in the universe is not a handicap but a positive opportunity for intelligent beings to make of the universe and its contents what they reasonably can. The book breaks new ground in suggesting a radical alternative to religion. It offers a scientific and humanist alternative to religion which appeals to people's critical faculties rather than emotions or intuitions. It also challenges current views of causation and the principle of sufficient reason by stressing the subjectivity of our reasoning powers and clarifying these in relation to an independent external reality. It develops and elaborates a notion of the 'noosphere' within a theoretical system, this enables the notion to assume a scientific importance which it currently lacks because it is treated as an isolated, eccentric and rather mystical idea.