The great lights who have come out of all the world's spiritual traditions and graduated from earth's schoolroom have become widely known as masters. They demonstrate that in the world of Spirit, there is no division of race, religion or philosophy--there is simply oneness, ineffable sweetness and love. What is not so widely known is that these great masters have retreats--temples and cities of light in the heaven world--where we can go in spiritual meditation and while our bodies sleep at night. In this comprehensive work, Mark and Elizabeth Prophet talk about these great masters, the stories of their lives and their magnificent spiritual retreats.