When the Shah of Persia wished to have the history of Persia written by some literary person, no one could be found to do it until the mystic poet Firdausi said that he would write it. And he wrote, from his inner knowledge, the Shah-nameh, the history of the Shahs of Persia. If he had this knowledge from the recollection of his own previous lives he must have reincarnated interruptedly in Persia and in Persia only, endowed each time with the same degree of intelligence, so as to have acquired and retained all this knowledge.