Children's emotions!

How can we know the emotions of the children?
Only we have to leave them to speak and to express their emotions.
Often the words of the children are taken as stupid words, but why?
They only say what they feel,their words are the more sincere.
We should let they express like they want,and listen to them, because in their words we can find very insteresting things!
I find so interesting a commentary of a girl who says 'when all you want to do is play and your best friend pushes you away' and two boys who say that be misunderstoods make them feel sad.