Among the followers of the great religions of the world, the majority of Christians, Jews, Mohammedans and Parsees deny the truth of transmigration. Of course, there was a time when the Christians believed in this transmigration theory. Origen and other Church Fathers accepted it until the time of Justinian, who anathematized all those who believed in Reincarnation or the pre-existence of the soul. Among the Jews we find that in the Cabala this idea of transmigration plays the most important part. In fact the Cabalists accepted this theory to explain all the difficulties that could not be explained by any other theory. But those Jews, Christians, Mohammedans and Parsees who do not believe in the theory of transmigration accept the one-birth theory; that is, that God creates the souls at the time of birth out of nothing, and these souls, having come into existence out of nothing, continue to live forever; that this is our first and last birth that we receive; we did not exist before, we are suddenly created by God, and after death each one of us will continue to live either in heaven or hell to enjoy or to suffer throughout eternity. Among the modern Spiritualists we find that those who are born and brought up with this idea of one birth do not accept the theory of transmigration. Still there are millions and millions of people all over the world who do believe in transmigration and who have found comfort and consolation in their lives as well as a satisfactory solution of the problems of life and death. The theory of Transmigration, or Metempsychosis, as it has been called by many philosophers, originally meant the passing of a soul from one body after death into another; or, in other words, it meant that the soul after dwelling in one particular body for a certain length of time leaves it at the time of death, and in order to gain experience enters into some other body, either human, animal or angelic, which is ready to receive it. It may migrate from the human body to an angelic body and then come down on the human plane, or to the animal plane and be born again as an animal. So the original meaning of transmigration or metempsychosis was the revolution of the soul from body to body whether animal, human, angelic or of the gods. The migrating substance being a fixed quantity, with fixed qualities, chooses its form according to its taste, desire and bent of character. This idea prevailed among the ancient Egyptians, according to whom the soul, after leaving the dead body, would travel from one body to another for thousands and thousands of years in order to gain experiences in each of the different stages of life.