Richness does not lie in the abundance of (worldly) goods but richness is the richness of the soul (heart, self).  

قَالَ رَسُولُ اللَّهِ ﷺ لَيْسَ الْغِنَى عَنْ كَثْرَةِ الْعَرَضِ وَلَكِنَّ الْغِنَى غِنَى النَّفْسِ