Therefore, fair Hermia, question your desires;
Know of your youth, examine well your blood,
Whether, if you yield not to your father's choice,
You can endure the livery of a nun,
For aye to be in shady cloister mew'd,
To live a barren sister all your life,
Chanting faint hymns to the cold fruitless moon. (1.1.67)
In the above lines uttered by Theseus to Hermia, what does the moon symbolize?