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MUTABILITY. by Percy Bysshe Shelley

Summary, meaning, line-by-line analysis & FAQ.

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Shelley's "Mutability" highlights the idea that nothing in human life remains constant — our moods, thoughts, and feelings are always changing, and the only certainty we have is that change is inevitable.

Poet
Percy Bysshe Shelley
Themes
identity, mortality, nature
The PoemFull text

MUTABILITY.

Percy Bysshe Shelley

[Published with “Alastor”, 1816.] We are as clouds that veil the midnight moon; How restlessly they speed, and gleam, and quiver, Streaking the darkness radiantly!—yet soon Night closes round, and they are lost for ever: Or like forgotten lyres, whose dissonant strings _5 Give various response to each varying blast, To whose frail frame no second motion brings One mood or modulation like the last. We rest.—A dream has power to poison sleep; We rise.—One wandering thought pollutes the day; _10 We feel, conceive or reason, laugh or weep; Embrace fond woe, or cast our cares away: It is the same!—For, be it joy or sorrow, The path of its departure still is free: Man’s yesterday may ne’er be like his morrow; _15 Nought may endure but Mutability. NOTES: _15 may 1816; can Lodore, chapter 49, 1835 (Mrs. Shelley). _16 Nought may endure but 1816; Nor aught endure save Lodore, chapter 49, 1835 (Mrs. Shelley). ***

Public domain

Sourced from Project Gutenberg

§01Quick summary

What this poem is about

Shelley's "Mutability" highlights the idea that nothing in human life remains constant — our moods, thoughts, and feelings are always changing, and the only certainty we have is that change is inevitable. He uses clouds and old stringed instruments to illustrate our restless and unpredictable nature. The poem wraps up with a stark realization: nothing endures except the truth that nothing endures.

§02Themes

Recurring themes

§03Line by line

Stanza by stanza, with notes

  1. We are as clouds that veil the midnight moon; / How restlessly they speed, and gleam, and quiver,

    Editor's note

    Shelley begins with a simile that suggests all of humanity shares a common experience: we are like clouds racing through a night sky. These clouds shine brightly for an instant—they "gleam" and "quiver"—but they quickly fade into darkness. This tension between fleeting brilliance and complete disappearance lays the groundwork for the entire poem's argument.

  2. Or like forgotten lyres, whose dissonant strings / Give various response to each varying blast,

    Editor's note

    The second image shifts from visual to auditory. An Aeolian lyre, which is a harp left in a window to be played by the wind, produces sounds based on the wind's movements — it can't control its own music. Shelley suggests we are like this: our inner feelings respond to whatever comes our way, and each moment creates a unique note.

  3. We rest.—A dream has power to poison sleep; / We rise.—One wandering thought pollutes the day;

    Editor's note

    The short, punchy sentences reflect the instability that Shelley describes. Even rest can't provide an escape: one dream can shatter sleep, and a fleeting thought can derail a waking day. We move through joy and sorrow, laughter and tears — experiencing all of them without warning or reason.

  4. It is the same!—For, be it joy or sorrow, / The path of its departure still is free:

    Editor's note

    The final stanza gives its verdict. Regardless of whether our feelings are positive or negative, they will eventually fade — the door remains open for any emotion to leave. The last two lines hit hard like a philosophical truth: yesterday and tomorrow are never the same, and the only constant is change itself. It’s a quietly powerful conclusion.

§04Tone & mood

How this poem feels

The tone is calm yet unsettling—like someone delivering bad news in an even voice. Shelley isn't angry about change or lamenting it; he's just presenting it as reality. There’s a cool resignation present, interrupted by the exclamatory dashes that imply he’s surprised by what he already understands. By the final line, the tone has transformed into something nearly stoic.

§05Symbols & metaphors

Symbols & metaphors

Clouds veiling the midnight moon
The clouds symbolize human beings — briefly bright, always shifting, and eventually consumed by darkness. The midnight backdrop removes any reassuring daylight, making the vanishing seem permanent rather than part of a cycle.
Forgotten lyres
The Aeolian lyre, gently played by the wind, symbolizes the human mind: we don’t control our moods or thoughts; we just react to the forces around us. The term "forgotten" brings in a sense of neglect and disconnection—these instruments lack a master and an audience.
The path of departure
This image of an open road or doorway, allowing any feeling to flow freely, embodies the central idea that nothing — neither joy nor sorrow — lasts forever. The "path" remains clear and ready to take something away from us at any time.
Yesterday and morrow
The connection between yesterday and tomorrow represents the entirety of human time. By claiming that the two can never be alike, Shelley undermines the notion of a stable self that endures over time.

§06Historical context

Historical context

Shelley published "Mutability" in 1816 alongside his longer poem *Alastor*, during a particularly chaotic time in his life. He had just separated from his first wife Harriet and had eloped with Mary Godwin, who would later become Mary Shelley. Living as a social outcast in England, the couple eventually left for Europe. The poem is deeply rooted in the Romantic tradition of reflecting inner feelings through nature, but it lacks the comfort that many Romantic poems provide. While Wordsworth might discover renewal in nature's cycles, Shelley sees only continuous change. The poem also shows the influence of Platonic philosophy, which Shelley had been studying — the notion that the material world is in constant flux, while only abstract ideals remain unchanged. The variant readings from 1835, introduced by Mary Shelley in her novel *Lodore*, highlight her deep engagement with his work even after his death in 1822.

§07FAQ

Questions readers ask

The poem's main idea is that change is the only constant in human life. Our moods, thoughts, and feelings are always in flux, and nothing — not happiness, not grief, and not even our sense of self — stays the same long enough to be trusted.

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