So lovely.

Get out of my head Kuno!
 
(Sorry, I remember this from Ranma 1/2)

Ah, thanks!

She want to marry a man but her father does not approve. I believe that’s the context. She (Hermia) speaks with Thesues and he advises her to marry the man that her father has chosen. She doesn’t want to and asks what is the worst that can happen.
 
He then says this line which in context means basically this (from no fear Shakespeare):
 
eople who can restrain their passions and stay virgins forever are holy. But although a virgin priestess might be rewarded in heaven, a married woman is happier on Earth. A married woman is like a rose who is picked and made into a beautiful perfume, while a priestess just withers away on the stem.
 
So basically he’s saying if she doesn’t marry Demetrius her only other options are being dead or being a nun. He cautions that being a nun may allow her to keep her virtue but her life will be all the more miserable (and implied useless on the earth.)

I am fascinated by the english language but it is a second language to me.  
This eludes me. What is he talking about?