[16].Surah An-Nahl [The Bees] : Ayat 13-14

Ayat 13. And whatsoever He has created for you on this earth of varying colours [and qualities from vegetation and fruits, etc. (botanical life) and from animal (zoological life)]. Verily! In this is a sign for people who remember.

Ayat 14. And He it is Who has subjected the sea (to you), that you eat thereof fresh tender meat (i.e. fish), and that you bring forth out of it ornaments to wear. And you see the ships ploughing through it, that you may seek (thus) of His Bounty (by transporting the goods from place to place) and that you may be grateful. 

Hazrat Abdullah bin Amr bin Al-Aas (May Allah be pleased with them) reported: Messenger of Allah  [SAWW](PBUH) said, "Successful is the one who enters the fold of Islam and is provided with sustenance which is sufficient for his day's needs, and Allah makes him content with what He has bestowed upon him.'' 

[Muslim Book 05, Chapter 40, Hadith # 2293]

Lesson: as mentioned above in Surah An-Nahl Ayat 14. and that you may be grateful. The real success of a man will be measured by his being blessed with Divine mercy and forgiveness in the Hereafter, and this is contingent on Islam alone. If he lacks the wealth of Islam, all the worldly possessions will not ensure his success in the next world. This Hadith tells us that richness is not to be defined in terms of a lot of belongings, and that the real richness is gauged by the contentment of the soul.