The eternal nature of beauty is the central idea of "Ode to a Grecian Urn".
The speaker returns to the urn in the final stanza and claims that it, like Eternity, "doth tease us out of thought." He believes that the urn will endure after his generation has long passed away and continue to impart the mysterious lesson that "Beauty is truth, truth beauty" to subsequent generations. That is the only option, the speaker claims.
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