I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
I'm sometimes white and always wrong.
I can break a heart and hurt the strong.
I can build love or tear it down.
I can make a smile or bring a frown.
It increases and decreases yet no one see it. It is not a fire and yet it can be quenched.See answer
Select a pack of riddles and try to solve it in an interesting way.
This riddle appears in the following downloadable PDF files: