REMAIN, ah not in youth alone!
--Tho' youth, where you are, long will stay--
But when my summer days are gone,
And my autumnal haste away.
'Can I be always by your side?'
No; but the hours you can, you must,
Nor rise at Death's approaching stride,
Nor go when dust is gone to dust.
Walter Savage Landor
http://www.poemhunter.com/poem/remain/
