Basically, the entire poem is about how the urn is an eternal teacher of history and of the world that it has seen, and of the world illustrated in it. The whole poem is about the urn being an everlasting art, but to be more specific, the 6th and 7th lines from the excerpt above express how the urn shall and will remain forever. Those lines say that when the people of this generation grown old and die, the urn will stay as it is -- beautiful and true.
Well for me there is no such thing society could be define sickness and health in other words society is like social and health and sickness is the sames so they are a difference