Twelfth Night

If music be the food of love, play on,
Give me excess of it that, surfeiting,
The appetite may sicken and so die.
That strain again, it had a dying fall.
O, it came o’er my ear like the sweet sound
That breathes upon a bank of violets,
Stealing and giving odour. Enough, no more,
’Tis not so sweet now as it was before.
O spirit of love, how quick and fresh art thou
That, notwithstanding thy capacity
Receiveth as the sea, naught enters there,
Of what validity and pitch so e’er,
But falls into abatement and low price
Even in a minute! So full of shapes is fancy
That it alone is high fantastical.
      -Act 1 Scene 1, Lines 1-15

This opening speech by Duke Orsino is beautiful right? Orsino asks his servants to give him excess music to cure his obsession for love, just like giving someone an excess amount of food will cure their obsessive hunger. Its like when you eat way to much ice cream, and you binged for an hour, and then you don't want any more ice cream for 100 years. Orsino is saying that if they keep playing the love music than he might get so sick of it that he will finally be over his love-obsession. He is comparing love to a physical appetite too which is interesting.

          There is no woman’s sides
          Can bide the beating of so strong a passion
          As love doth give my heart; no woman’s heart
          So big, to hold so much. They lack retention.
          Alas, their love may be called appetite,
          No motion of the liver, but the palate,
          That suffer surfeit, cloyment, and revolt.
          But mine is all as hungry as the sea,
          And can digest as much. Make no compare
          Between that love a woman can bear me
          And that I owe Olivia.
               -Act 2 Scene 4, Lines 91–101

Another quote by Duke Orsino. Here he is saying that the love a woman feels for a man can not be compared to the love that a man feels towards a woman. He calls his love strong, passionate, and constant....while a woman's love is wavering and lacks retention. He says that woman love superficially and momentarily, while men love longer and more genuinely. 
Pretty weird though because Orsino changes his love from Olivia, who he is obsessed with, to Viola. And Viola is the one who stays in love the entire time. So Orsino's has these theories about love which are proven wrong by himself and Viola.