comes from the use of his or her intelligence.
Religious books such as the Koran and Bible discuss faith as a form of happiness.
The British scientist Charles Darwin believed that all species were formed in a way so as to enjoy happiness.
And, The United States Declaration of Independence guarantees "life, liberty and the pursuit of happiness" as a basic human right.
People throughout history may have had different ideas about happiness.
But today, many people are still searching for its meaning.