These quotations make great writing prompts or discussion starters:
We are never so happy nor so unhappy as we imagine.
….folks are generally about as happy as they have made up their minds to be.
I know what happiness is, for I have done good work.
The only way on Earth to multiply happiness is to divide it.
Never miss an opportunity to make others happy, even if you have to let them alone to do it.
I am born happy every morning.
Joy is not in things, it is in us.
Happiness is a thing to be practiced like a violin.
The secret of happy living is not to do what you like but to like what you do.
The way to be happy is to make others happy.
We do not know how cheap the seeds of happiness are or we would scatter them oftener.
Happiness is the only thing we can give without having.
There is no cosmetic for beauty like happiness.
Happiness is not a station you arrive at, but a manner of traveling.
Today is the tomorrow you worried about yesterday.