Surah At-Taubah, Ayat 69

Ayat 69. Like those before you, they were mightier than you in power, and more abundant in wealth and children. They had enjoyed their portion awhile, so enjoy your portion awhile as those before you enjoyed their portion awhile; and you indulged in play and pastime (and in telling lies against Allah and His Messenger Muhammad  [SAWW](PBUH) as they indulged in play and pastime. Such are they whose deeds are in vain in this world and in the Hereafter. Such are they who are the losers. 

Hazrat Shaddad bin Aus (May Allah be pleased with him) reported: The Prophet [SAWW](PBUH) said, "A wise man is the one who calls himself to account (and refrains from doing evil deeds) and does noble deeds to benefit him after death; and the foolish person is the one who subdues himself to his temptations and desires and seeks from Allah the fulfillment of his vain desires". [At-Tirmidhi Hadith # 2459].   

Lesson : as mentioned above in Surah At-Taubah Ayat 69 " They enjoyed their portion awhile, so enjoy your portion awhile as those before you enjoyed their portion awhile" This Hadith highlights the importance of the accountability of one's self. Mere desires which are not coupled with practical efforts are of no avail because Allah grants reward on good deeds and not on yearnings and desires which are not supported by noble actions.