help others is the best way to help yourself which will also make you be happy.So in a way ,no helping ,no happy.  -33.15% -33.15%  

References

http://pakobserver.net/detailnews.asp?id=88103

http://www.0592en.com/meiriyingyu/englishreading/2010/0924/5232.html

http://www.baidu.com/

http://www.essayforum.com/undergraduate-admission-2/essay-happiness-factors-important-achieving-happiness-20160/

https://baike.baidu.com/item/%E8%B5%A0%E4%BA%BA%E7%8E%AB%E7%91%B0%2C%E6%89%8B%E6%9C%89%E4%BD%99%E9%A6%99

https://baike.baidu.com/item/%E8%B5%A0%E4%BA%BA%E7%8E%AB%E7%91%B0%2C%E6%89%8B%E6%9C%89%E4%BD%99%E9%A6%99?wtp=tt