Arabic text
عن أبي هريرة رضي الله عنه عن النبي صلى الله عليه وسلم قال: «ليس الغِنَى عن كَثرَة العَرَض، ولكن الغِنَى غنى النفس».
Translation
Abu Hurayrah (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "Richness is not the abundance of wealth. Rather, true richness is self-sufficiency."
Explanation
The Prophet (may Allah's peace and blessings be upon him) highlights that true richness is not in the abundance of wealth. Rather, it is self-sufficiency. So a person becomes the richest of people when he sufficiently relies on what he already possesses and is contented with it, without being keen to gain more or insisting on demanding more.
Source: HadeethEnc.com