A great deal is happening all the time in world evolution; and it falls to human beings, particularly those of our own time, to acquire real understanding of the world events in which they are involved. In this popular lecture Rudolf Steiner reveals that the angels - the spirits closest to human beings - are seeking to create images in human astral bodies. These images are given with the intention of bringing about 'definite conditions in the social life of the future' related to brotherhood, religious freedom, and conscious spirituality. Other spiritual beings, however, are working against the angels. If, as a consequence of their disruption, humanity sleeps though the angels' spiritual revelation, the consequences will be dire, and aberrations connected to sexuality, the misuse of medicine, and the misapplication of mechanical forces will begin to manifest.