understand the meaning of happniess

On the well-being of different people have different interpretations.
Of Lei Feng,the can when the community a screw themselves engaged in revolution and construction to that happiness.To this happiness,he returning lost money,self-sacrifice.
Of the Helen Keller said,to give themselves three days of light,so that my feelings and not only see the sun,hear the birds,even so in the hearts of infinite imagination into reality a little limited this is the well-being.
Hai Zi,the warmth of spring can be deeply felt towards the sea,even if it is "from tomorrow" a blessing.
Of the Little Match Girl,the Christmas Eve in dying in dreams nestled in his mother's side is a blessing.
On Genghis Khan,his cavalry riding to all the land under the sun when he felt happy.
On the Zhuangzi,he dreamed of when the butterfly is a blessing.