 For Plato we should live according to what reason is able to deduce from what we regard as reliable evidence. This is what real philosophers, like Socrates, do. But the non-philosophers are reluctant to ground their lives on logic and arguments. They have to be persuaded. One means of persuasion is myth. Myth inculcates beliefs. It is efficient in making the less philosophically inclined, as well as children (cf. Republic 377a ff.), believe noble things.