How do you define Happiness?

I'm not happy nor sad right now. I guess when we have peace of mind we can easily be happy for the little things that we achieve from day to day. Honestly, It's really hard to define happiness and what is it when we're happy. But I experienced happiness for several times.

I'm happy that i received a simple message from a friend that i've been missing so much lately. I find joy in looking at my flowers and seeing my son sleeping alone in his bed. I find happiness in my son all the time and in everything that he does. I'm happy that i have a husband and thankful that our family is doing well and not starving.

Happiness may be defined in different ways by different people. It can be defined as a state of mind. How we are feeling? We say state of mind. But actually where is mind? How is it? what is its color or shape? So mind itself is a abstract and so is happiness. Being happy means being contended spiritually and materialistically. If there is no balance between spiritualism and materialism then there won't be happiness. But now in this world, people are all materialistic which does not bring them contentment. They achieve something and then think of achieving something better than what they have achieved. It is like drinking salty water to quench their thirst. The more we drink the more thirsty we are. Even richest people can be sad and even poorest can be happy. We must learn to be contended of what we have. People who is contended has everything in his life including happiness.