Happiness is activity.

The activity of happiness must occupy an entire lifetime; for one swallow does not a summer make

Happiness is the meaning and the purpose of life, the whole aim and end of human existence.

Being happy doesn't mean that everything is perfect. It means that you've decided to look beyond the imperfections.

To live happily is an inward power of the soul. -Aristotle.

Happiness does not lie in amusement; it would be strange if one were to take trouble and suffer hardship all one's life in order to amuse oneself