For if it be true that the myths which are related about Hades, in spite of the fact that their subject-matter is fictitious, contribute greatly to fostering piety and justice among men, how much more must we assume that history, the prophetess of truth, she who is, as it were, the mother-city of philosophy as a whole, is still more potent to equip men's characters for noble living. 

- Diodorus Siculus