Dear BIC, the buddha taught us many things...as our minds
expanded and matured, He taught new things and new
methods...according to our level of understanding....
When he taught "nothing is permanent" he meant by the "eternal
nature of all phenomena"....vicious cycles of birth, old age,
sickness and death....even the universes are no exception....
Some people are happy with the preliminary stuffs the buddha
taught, others went for advanced stuffs, some even mastered the
supreme level stuffs....that's why there are so many different
schools in buddhism....
But how can "nothing is permanent" be squared with an eternal
universe? To my mind, if nothing is permanent, then it also applies
to the phrase itself, and it becomes self-refuting.