Fight for Joy

"Happiness is different than joy." -Matthew Mcconaughey. 
Happiness is cause and effect. It is an emotional response to an outcome. (If I get this job, I'll be happy.) (if my artist career takes off, I'll be happy) (if I lose this 10 pounds, I'll be happy.). It's so reactive and you will be let down more often than not.
Joy on the other hand is a constant that we pursue. It does not depend upon an outcome. You can have nothing and still have joy. 
Fight for joy. Pursue joy and you will ultimately become happy.