One of the things that strong brands do is they create for themselves a "creation myth," a story that captures their foundation, their beliefs, their over-coming of the odds, their strength.
Homer's "Iliad" and "Odyssey" were creation myths that unified the people of ancient Hellas, just as Virgil's "Aeneid" glued together the Roman Empire, just as stories about the Revolutionary War and Washington crossing the Delaware helped define the American character.
These are (or were) important brands in their time.
Today, brands like Apple, Mercedes-Benz, IBM and a few others have creation myths--strong stories that define them.
At its most elemental and its best, advertising finds or creates creation myths. It finds a way to make a brand understandable, important, likeable and true.
I know such lofty thoughts can get in the way of writing another "This Fall, Rake in the Savings" ad, but sometimes it's nice to dream.