Because I've often wondered how, in the words of someone far more articulate than I, "joy can be effervescent in a person whose circumstances look bleak and how joyless a person can be in spite of great blessing. How many times have we seen a person in a wheelchair just beaming, and a wealthy, healthy person just plain miserable?"
From disciplegideon's blog:
Happiness comes when things go your way; joy flows despite things not going your way.
Happiness comes when circumstances are favorable; joy comes regardless of circumstances.
Happiness is fleeting and based on emotion; joy is permanent and not based on emotions.
Happiness is a never-ending pursuit; joy is a never-ending rest.
Happiness comes from natural, tangible sources; joy comes from supernatural, intangible sources.
Happiness comes when you are loved; joy comes when you love others.
Happiness feeds the soul; joy feeds the spirit.
Happiness is in finding what pleases you; joy is in finding what pleases another.
Happiness is a goal; joy is a gift.
Happiness can be earned and strived for; joy cannot be earned.
Happiness is a personal quest with diminishing returns; joy is a selfless quest that is ever-growing.
Happiness can come at the expense of another; joy comes as we pour ourselves into another.
Happiness is temporary; joy is permanent.