[108] Cæsar (_De Bello Gallico_, VI, XIV, 4) says the Druids believed the soul passed from one individual to another.
[109] A Spaniard of the first century A.D.
Of special interest is the statement that the Druids believed in the doctrine of Transmigration of Souls--that is, they believed that after death the soul passed from one individual to another, or into plants or animals before again passing into a human being at birth. According to Diodorus Siculus, who lived in the latter part of the first century A.D., the Gauls took little account of the end of life, believing they would come to life after a certain term of years, entering other bodies. He also refers to the custom of throwing letters on the funeral pyre, so that the dead might read them.[110] This suggests a belief in residence for a period in a Hades.
The doctrine of Transmigration of Souls did not, however, prevail among all Celtic peoples even in Gaul. Valerius Maximus, writing about A.D. 30, says that the Gauls were in the habit of lending sums of money on the promise that they would be repaid in the next world. Gaelic and Welsh literature contains little evidence of the doctrine of Transmigration of Souls. A few myths suggest that re-birth was a privilege of certain specially famous individuals. Mongan, King of Dalriada in Ulster, and the Welsh Taliessin, for instance, were supposed to have lived for periods in various forms, including animal, plant, and human forms, while other heroes were incarnations of deities. The most persistent British belief, however, was that after death the soul passed to an Otherworld.
Julius Cæsar says that Druidism was believed to have originated in Britain.[111] This cannot apply, however, to the belief in transmigration of souls, which was shared in common by Celts, Greeks, and Indians. According to Herodotus, "the Egyptians are the first who have affirmed that the soul is immortal, and that when the body decays the soul invariably enters another body on the point of death". The story of "The Two Brothers" (Anpu and Bata) indicates that the doctrine was known in Egypt. There are references in the "Book of the Dead" to a soul becoming a lily, a golden falcon, a ram, a crocodile, &c., but this doctrine was connected, according to Egyptologists, with the belief that souls could assume different shapes in the Otherworld. In India souls are supposed to pass through animal or reptile forms only. The Greek doctrine, like the Celtic, includes plant forms. Certain African tribes believe in the transmigration of souls.