It

How does it look like? Does it have a look or any physical appearance?
It lives inside us and spread silently around the living souls.
It is something which can be happy/sad, sweet/sour, warm/cold...
It comes and goes at the right time, no one will ever knows exactly when it comes and goes, because it is sort of surprise in between you and i.

There are people who wanted it for so much, demanding it from day until night; still they got nothing, sad ending? In contrary, there are some people who think they don't need it. I live, work and do anything just to keep myself alive. Perhaps, selfless and selfish balance up the universe of it.

When the right time comes, you will know the answer...