Analysis of Prelude

OUT of the west when the sun was dying
Clouds of white wings came flying, flying,
Wheeling and whirling they swept away
Into the heart of the eastern gray;
But one white dove came straight to my breast
Out of the west.

Into the west when the dawn was pearly
Clouds of white wings went, dewy-early,
Straight from the world of the waning stars;
O beating pinions! O prison bars!
My dove flies free no more with the rest
Into the west.