Happiness is not a destination. It is a method of life.

                         Our greatest happiness does not depend on the condition of life in which chance has placed us, but is always the result of a good conscience, good health, occupation, and freedom in all just pursuits.

 All of us have had the experience of a sudden joy that came when nothing in the world had forewarned us of its coming - a joy so thrilling that if it was born of misery we remembered even the misery with tenderness. 

You will never be happy if you continue to search for what happiness consists of.  You will never live if you are looking for the meaning of life.

Happiness is not being pained in body or troubled in mind.You need to learn to be happy by nature, because you'll seldom have the chance to be happy by circumstance. On the whole, the happiest people seem to be those who have no particular cause for being happy except that they are so.To be happy, we must not be too concerned with others.In order to have great happiness you have to have great pain and unhappiness - otherwise how would you know when you're happy?Enjoy the little things, for one day you may look back and realize they were the big things.
 

P/S : Happiness is not a state to arrive at, but a manner of traveling.