[16].Surah An-Nahl [The Bees] : Ayat 33-34

Ayat 33. Do they (the disbelievers and polytheists) await but that the angels should come to them [with torment or to take away their souls (at death)], or there should come the command (i.e. the Day of Resurrection) of your Lord? Thus did those before them. And Allah wronged them not, but they used to wrong themselves.  
34. Then, the evil results of their deeds overtook them, and that at which they used to mock surrounded them.

Hazrat Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah  [SAWW](PBUH) said, "Hasten to do good deeds before you are overtaken by one of the seven afflictions.'' Then (giving a warning) he said, "Are you waiting for poverty which will make you unmindful of devotion, or prosperity which will make you corrupt, or a disease which will disable you, or senility which will make you mentally unstable, or sudden death which will take you all of a sudden, or Ad-Dajjal who is the worst expected, or the Hour; and the Hour will be most grievous and most bitter.''

[At-Tirmidhi Hadith # 2306].

Lesson : as mentioned above in Surah An-Nahl Ayat 34.the evil results of their deeds overtook them, and that at which they used to mock surrounded them. The Hadith focuses on seven things which hold back man from the virtuous path. Taking in consideration the turning health and the brief span of life to his account, he is, therefore, apt to gather up good deeds for the Hereafter because an untoward situation may confront him any moment and render him unable to do good things to his benefit in the otherworldly life.