These Egyptian stories are for the benefit of whoever believes such tales: my rule in this history is that I record what is said by all as I have heard it. The Egyptians say that Demeter and Dionysus are the rulers of the lower world. The Egyptians were the first who maintained the following doctrine, too, that the human soul is immortal, and at the death of the body enters into some other living thing then coming to birth; and after passing through all creatures of land, sea, and air, it enters once more into a human body at birth, a cycle which it completes in three thousand years. There are Greeks who have used this doctrine, some earlier and some later, as if it were their own; I know their names, but do not record them.