"The Dharma is the best teacher," he said, "even if I were to live for eons I'd still have to leave you because every meeting implies a departure, one day."
The Buddha died the way he lived, as a spirtual teacher, amazing compared to none other. Legend says that his final nirvana (death/ extinction) was on a night in May with a full moon, just as his birth and his enlightenment.
His life was, in itself, a teaching. We all have the capacity to live a life full of balance, joy, harmony, love, clarity, energy, tranquility and excellence if we embrace and become it.
We can all be Buddhas.