Myth (n.) about ancient events are falsehoods made useful by making them as much like the truth as we can, since we don't know what happened.
Myth (n.) may be, to Socrates, a true account: what he is about to tell will sound to Callicles like a mere tale, but he tells it as the truth.
A Myth (n.) is not to be insisted on, but a man should risk believing it — the risk is a noble one — and repeat it to himself like an incantation.
Myth (n.) of gods punishing fathers should, even if true, be passed over in silence — or told to a very few, sworn to secrecy, after sacrificing something great and scarce.
A Myth (n.) explained away rationally never stops at one: after Boreas come the Hippocentaurs, the Chimera, and a whole flood of Gorgons and Pegasuses that will overwhelm the explainer.