Only until this cigarette is ended, 
A little moment at the end of all, 
While on the floor the quiet ashes fall, 
And in the firelight to a lance extended, 
Bizarrely with the jazzing music blended, 
The broken shadow dances on the wall, 
I will permit my memory to recall 
The vision of you, by all my dreams attended. 
And then adieu,—farewell!—the dream is done. 
Yours is a face of which I can forget 
The color and the features, every one, 
The words not ever, and the smiles not yet; 
But in your day this moment is the sun 
Upon a hill, after the sun has set.
Edna St. Vincent Millay
http://www.poemhunter.com/poem/sonnets-04-only-until-this-cigarette-is-ended/