This is fourth and final part of Sailing to Byzantium. 

Sailing to Byzantium 

By William Butler Yeats 

IV

Once out of nature I shall never take

My bodily form from any natural thing,

But such a form as Grecian goldsmiths make

Of hammered gold and gold enamelling

To keep a drowsy Emperor awake;

Or set upon a golden bough to sing

To lords and ladies of Byzantium

Of what is past, or passing, or to come.