Shelley opens with a flower that blooms one day and dies the next, then builds from that image to a blunt meditation on impermanence. Everything we long to hold onto—delight, virtue, friendship, love—teases us with brief brightness before vanishing or turning sour. The speaker compares the world’s joy to a flash of lightning that mocks the darkness, intense and already gone. There’s a bitter shrug in the observation that we outlive everything we call our own, carrying on after the glow fades. Yet the final stanza doesn’t just mourn; it offers a weary piece of advice. While the skies are still blue and faces still smile, go ahead and dream—but know the waking will bring tears. The mood is reflective and quietly devastated, not angry. It’s the voice of someone who has watched beauty and hope dissolve enough times to accept the cycle without rebellion.
Mutability — Summary
The flower that smiles to-day To-morrow dies; All that we wish to stay Tempts and then flies. What is this world's delight? Lightning that mocks the night, Brief even as bright.
Virtue, how frail it is! Friendship how rare! Love, how it sells poor bliss For proud despair! But we, though soon they fall, Survive their joy, and all Which ours we call.
Whilst skies are blue and bright, Whilst flowers are gay, Whilst eyes that change ere night Make glad the day; Whilst yet the calm hours creep, Dream thou--and from thy sleep Then wake to weep.