Mutability by Percy Bysshe Shelley

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.

It suggests that the one constant in life is change itself. Everything else — our emotions, experiences, and the people in our lives — eventually fades away. This line captures the essence of the entire poem, serving as both a thought-provoking insight and a subtle blow to the gut.

An Aeolian lyre, also known as a wind harp, is a stringed instrument set up in a window or doorway, allowing the wind to play it on its own. Shelley chooses this instrument because it lacks agency; it simply reacts to the forces around it. This passivity perfectly reflects his view of the human mind: we don’t have control over our inner states; we merely respond to external influences.

The poem consists of four quatrains, each with four lines, following an ABAB rhyme scheme. While the meter is mostly iambic pentameter, Shelley introduces variations to prevent it from sounding mechanical. This consistent structure ironically contrasts with the theme of ongoing instability.

It really depends on your interpretation. Shelley doesn’t provide hope or comfort, which makes it feel pretty bleak. However, there’s also a liberating aspect to the notion that sorrow, just like joy, will eventually leave — "the path of its departure still is free." The poem isn’t about wallowing in despair; it’s more about diagnosing the situation.

The theme of impermanence is a recurring element in much of Shelley's work. Ozymandias illustrates the downfall of human power and legacy. Similarly, Ode to the West Wind employs wind and the natural flow of life as metaphors for change, but this poem carries a more personal sense of anguish and concludes with a hopeful tone.

Midnight is the darkest moment — there's no sunrise on the horizon to rescue the image. The clouds shine momentarily against that darkness, making their disappearance feel more absolute. If Shelley had depicted a daytime sky, the clouds would merely be clouds. But at midnight, their vanishing feels like extinction.

Mary Shelley made some slight alterations to those lines in her 1835 novel Lodore — swapping "may" for "can" and changing "Nought may endure but" to "Nor aught endure save." While the meaning remains largely unchanged, these variations indicate that she continued to engage with his poems long after his death, viewing them as dynamic works rather than static relics.