I'm curious about something - the Eleusinian Mysteries endured for roughly 1500 years in ancient Greece. Did the initiation of figures like Plato and Socrates help sustain these sacred rites across so many centuries? What made them so resilient?

I'm curious about something - the Eleusinian Mysteries endured for roughly 1500 years in ancient Greece. Did the initiation of figures like Plato and Socrates help sustain these sacred rites across so many centuries? What made them so resilient?