Happiness

I was just wondering,
What is happiness?
Is it just the opposite of sadness?
Or just a state of mind.

Also read, that it is the sorrow and despair
which brings the best out of the chosen ones.
Why is it so?
Or is the the thing,
Which makes you to give your all
When thrown against a wall.

Why the creative minds flourish in pain?
Why pain brings best and the worst out of people?
Why despair makes people crazy?
Why is that the situation that makes one happy makes another sad?

Different reactions to different situation by different people.
This is question which is asked regularly,
But never answered .
This is question best left unanswered
To be asked again,
What is Happiness?
Is it just the opposite of sadness?
Or just a state of mind.