If what was supposed to have been destroyed in Paradise was destructible, then it was not decisive; but if it was indestructible, then we are living in a false belief.
There are two main human sins from which all the others derive: impatience and indolence. It was because of impatience that they were expelled from Paradise; it is because of indolence that they do not return. Yet perhaps there is only one major sin: impatience. Because of impatience they were expelled, because of impatience they do not return.