Into my heart an air that kills
From yon far country blows:
What are those blue remembered hills,
What spires, what farms are those?
That is the land of lost content,
I see it shining plain,
The happy highways where I went
And cannot come again.
A. E. Housman
http://www.poemhunter.com/poem/into-my-heart-an-air-that-kills/