"O mankind, you are those in need of Allah, while Allah is the Free of need, the Praiseworthy. If He wills, He can do away with you and bring forth a new creation. And that is for Allah not difficult." Verse 15, 16, 17, Surat Fatir, Chapter 22
Hadith
"Richness does not mean having a great amount of property, but richness is self-contentment." Source: Sahih al-Bukhari