From this bleeding hand of mine,
Take this sprig of Eglantine:
Which, though sweet unto your smell,
Yet the fretful briar will tell,
He who plucks the sweets, shall prove
Many thorns to be in love.
Robert Herrick
http://www.poemhunter.com/poem/the-bleeding-hand-or-the-sprig-of-eglantine-give/