Who talks of Plato's spindle;
What set it whirling round?
Eternity may dwindle,
Time is unwound,
Dan and Jerry Lout
Change their loves about.
However they may take it,
Before the thread began
I made, and may not break it
When the last thread has run,
A bargain with that hair
And all the windings there.

William Butler Yeats

http://www.poemhunter.com/poem/his-bargain/