Who is this mortal
Who ventures to-night
To woo an immortal,
Cold, cold the moon's light
For sleep at this portal,
Bold lover of night.
Fair is the mortal
In soft, silken white,
Who seeks an immortal.
Ah, lover of night,
Be warned at the portal,
And save thee in flight!

Ernest Christopher Dowson

http://www.poemhunter.com/poem/who-is-this-mortal/