In the earlier stanzas, the speaker has described the scenes of beauty on the urn, the young lovers and beautiful natural features. He assures the young man on the urn that, though he will never get the kiss for which he longs, his lover's beauty will never fade and their love will never age or wither. In the fourth stanza, however, the speaker considers the town from which all of these people have come, the town which has been "emptied of this folk, this pious morn." He realizes that those streets will be silent and empty forever, now, because all of the people have come here, and they will never be able to return home. In other words, while this scene of beauty and joy exists, another scene of desolation and apparent sadness has been created, invisibly, elsewhere. This draws attention to one of the poem's main ideas: that true beauty lies in what is fleeting and ephemeral; death and mortality lend importance and beauty to people and scenes. It is the desolate town that lends greater beauty to the scene of delight; we cannot fully enjoy the feelings associated with one without understand, by experience, the feelings produced by the other.