I have always believed that the definition of happiness in most dictionaries is not completely correct. They are simply half-truths. You need to know sadness in order to know and understand happiness. Secondly, you need to be a child to be really happy. That is, blameless, almost sinless. Pure in heart. I know some people will not agree with me on this to some extent but this is my own opinion.
Please take a look at the photo below and judge for yourself.
Any need for further comments?