Even the fulfillment of desire doesn't necessarily make you happy, because there is a satiation factor.  You can really love apple pie and get some apple pie and eat it.  And you feel good for a minute.  And you can say, well, 'heck, i felt good eating that apple pie, why not eat ten?" If this is what makes me happy, then let me just keep doing it.  But after awhile if we do the same thing in the same way, over and over, repetitively, we get a sense of satiation.  It just doesn't feel good anymore, it doesn't taste as good.  Bleah!  WE're not happy.  So even desire taken to an extreme doesn't necessarily make us happy. It tends to make us actually rather cynical. What makes us happy and what increases happiness is contact with light.  The experience of light in a very pure form, if not the purest form, always creates happiness.  And the experience of desire and aversion, tends to create unhappiness.

- "Personal Happiness", The Enlightenment Series