Happy according to Islam and the Koran

Happiness, this is what humans always pursue. Humans want to live happily. Live a quiet, serene, peaceful, and prosperous life. Some people pursue happiness by working hard to accumulate wealth. He thought that in the abundance of wealth there was happiness. There are those who pursue happiness on the throne, on power. He did various ways to seize power. After all, power is synonymous with happiness and enjoyment in life. With power one can do a lot. The sick thought, happiness lies in health. Poor people think that happiness lies in wealth. The common people think that happiness lies in power. And other assumptions. So what is called “Happy Life” (sa’adah/happiness)? What is the meaning of happiness according toIslam.??