"It was wrong to do this," said the angel.
"You should live like a flower,
Holding malice like a puppy,
Waging war like a lambkin."

"Not so," quoth the man
Who had no fear of spirits;
"It is only wrong for angels
Who can live like the flowers,
Holding malice like the puppies,
Waging war like the lambkins."

Stephen Crane

http://www.poemhunter.com/poem/it-was-wrong-to-do-this-said-the-angel/