The poem’s central theme is the transient nature of human existence. The scenes on the urn evoke stories of romantic pursuit and religious ceremony. In reality, such scenes come to pass in brief moments. The urn provides a space where such stories can be frozen and made essential. Thus the poem itself is a kind of urn. The poem pulls images, figures, and ideas from the ceaseless flow of life and distills them for study and reflection.
One could then say that another of Keats’s themes is the value of art in offering a space for timeless reflection. As the poem’s final lines claim, pure aesthetic experience is in itself the source of all truth: “‘Beauty is Truth, Truth Beauty,’—that is all/Ye know on earth and all ye need to know.’” In life we are subject to ceaseless motion and the endless ticking of the clock. Beauty can only reveal itself in moments of complete presence, in which the normal flow of time is suspended. Thus urns and poems invite us to encounter real beauty.
""Beauty is Truth, Truth Beauty,"..."See in text(Ode on a Grecian Urn)
The poem concludes with a now-famous aphorism: "'Beauty is Truth, Truth Beauty.'" Here Keats establishes an equivalence between two of the transcendental properties of being articulated by Plato: Truth, Beauty, and Goodness. There is no simple summary of Keats's formulation. Indeed, the final wisdom of the urn has been a source of ongoing debate among poets, readers, and scholars for the last two centuries. There are debates over both Keats's intended meaning and the veracity of the aphorism. One way to parse the phrase is to say that objects and scenes of great beauty contain some form of truth for the beholder. That is to say, things occur to us as beautiful for a reason. Conversely, truth itself—the elegant articulation of the world—brings its own illuminating beauty into the world. One might say that, in the context of the poem, the urn offers beauty to be transmuted into truth ("Beauty is Truth") and that Keats's poem is, as an artifact of language, an assertion of truth that is also beautiful, both for its precision of form and its clarity of thought ("Truth Beauty").
"When old age shall this generation waste,
Thou shalt remain..."See in text(Ode on a Grecian Urn)
Although it is suggested metaphorically earlier in the poem, this is the first instance in which the speaker acknowledges human death. The urn, however, will live on. This imminent sense of finitude heightens the speaker's encounter with the ancient urn, from whom he solicits the timeless wisdom of the final lines.
"art desolate..."See in text(Ode on a Grecian Urn)
The urn itself is a symbol of both life and death: life in the timelessness of its art and death in the intended use of the urn (ashes). By presenting images of joy and sacrifice on the urn, Keats tells the reader we can’t have joy without despair, we can’t have life without death, and the immortality of art means it must withstand both forever.
"What men or gods are these..."See in text(Ode on a Grecian Urn)
Literally speaking, the speaker is addressing the art on the urn. However, taking into account the previous lines that address the urn’s ability to tell stories, the speaker is pleading for the urn to answer questions about life, death, and art. The speaker wishes to uncover what the urn has learned during its extended time on earth. With these questions, Keats establishes the dialectic between art and its audience as a means to discover truth, a main theme of this poem.
"a parching tongue..."See in text(Ode on a Grecian Urn)
Keats compares the effects of "breathing" or mortal passions with a disease whose symptoms include fever ("a burning forehead"), dehydration ("a parching tongue"), and a broken heart. The word "cloy'd" also suggests that human passion is sappy or overly sweet, where the immortal love on the urn is timeless and refined.
"All breathing human passion far above..."See in text(Ode on a Grecian Urn)
The "happy love" portrayed on the urn proves itself to be far better than human love or "passion," which necessarily decays with time and becomes less beautiful and less pure as it goes. "Breathing" here is synonymous with "mortal" and "temporary."
"Cold Pastoral..."See in text(Ode on a Grecian Urn)
Broadly speaking, the "pastoral" refers to the ideal state of nature. Its roots are Latin, pastoralis meaning the tending of livestock. In poetry, the pastoral is a type of poetry that glorifies the natural world. The urn is characterized as a "Cold Pastoral" because its scenes move from the ideal to the realistic, incorporating images of sacrifice and suffering.
The verb "tease" here operates in both the amorous sense (a nod to the "marble men and maidens" teasing one another) and the literal sense—that is, to provoke or disturb. The the urn, with its antique, layered images of timeless human stories, stuns the speaker into a confrontation with eternity.