The book explains how at the heart of the human experience are the processes of evolution, first biologically and then culturally. Says the author, "We have come a very long way in a very short time, as cosmic change goes. Mind and spirit must be seen as an expression of the creative processes of nature. The evolution of the human brain is nature's most complicated and powerful creation. Our spirituality is found to be a product of complex evolutionary process, expressing itself through prehistoric times and the hominid precursors of modern humans. We are in a highly preferential position to understand both the continuity of the human experience, and also its expression in the discoveries of today. Metaphysics, however, still demands an uncaused origin of the universe, which we can rightly refer to as God..."