The trees are in their autumn beauty, The woodland paths are dry, Under the October twilight the water Mirrors a still sky; Upon the brimming water among the stones Are nine and fifty swans.
The nineteenth Autumn has come upon me Since I first made my count; I saw, before I had well finished, All suddenly mount And scatter wheeling in great broken rings Upon their clamorous wings.
I have looked upon those brilliant creatures, And now my heart is sore. All's changed since I, hearing at twilight, The first time on this shore, The bell-beat of their wings above my head, Trod with a lighter tread.
Unwearied still, lover by lover, They paddle in the cold, Companionable streams or climb the air; Their hearts have not grown old; Passion or conquest, wander where they will, Attend upon them still.
But now they drift on the still water Mysterious, beautiful; Among what rushes will they build, By what lake's edge or pool Delight men's eyes, when I awake some day To find they have flown away?
William Butler Yeats was an Irish poet and dramatist, and one of the foremost figures of 20th century literature. A pillar of both the Irish and British literary establishments, in his later years Yeats served as an Irish Senator for two terms. He was a driving force behind the Irish Literary Revival, and along with Lady Gregory and Edward Martyn founded the Abbey Theatre, serving as its chief during its early years. In 1923 he was awarded the Nobel Prize in Literature for what the Nobel Committee described as "inspired poetry, which in a highly artistic form gives expression to the spirit of a whole nation." He was the first Irishman so honored. Yeats is generally considered one of the few writers who completed their greatest works after being awarded the Nobel Prize; such works include The Tower (1928) and The Winding Stair and Other Poems (1929).
Yeats was born and educated in Dublin but spent his childhood in County Sligo. He studied poetry in his youth, and from an early age was fascinated by both Irish legends and the occult. Those topics feature in the first phase of his work, which lasted roughly until the turn of the century. His earliest volume of verse was published in 1889, and those slow paced and lyrical poems display debts to Edmund Spenser and Percy Bysshe Shelley, as well as to the Pre-Raphaelite poets. From 1900, Yeats' poetry grew more physical and realistic. He largely renounced the transcendental beliefs of his youth, though he remained preoccupied with physical and spiritual masks, as well as with cyclical theories of life. --from Wikipedia