O, when mine eyes did see Olivia first,
Methought she purged the air of pestilence.
That instant was I turned into a hart,
And my desires, like fell and cruel hounds,
E’er since pursue me.

– William Shakespeare

Twelfth Night, Act 1, Scene 1. Orsino makes no secret of the fact that he is obsessed with the beautiful Olivia, and the only thing he wants it to be with her. Describing how he first fell in love, he compares himself to a deer being hunted by hounds. His unrequieted desire is bringing him much pain, sadness and not a little madness.