In this history of human consciousness, Steiner explains that the world ended in A.D. 300, when it became impossible to find spirit in nature. Since then, we have been living in an increasingly spiritual world on a disintegrating, dying Earth. Although people have been asleep to the spiritual reality that surrounds us, Steiner shows a way out of today's blind materialism that takes us toward a new spiritual perception and knowledge, which is the only way that we will find the Christ in our time. In these exciting lectures, Steiner also talks about the true nature of numbers, they Mystery of the Grail, and the development of materialism. We need to let go of materialism now that it has fulfilled its task of making us true citizens of Earth. Through spiritual science, we must now be come citizens of the spiritual world.