Surah Yunus, Ayat 11

Ayat 11. And were Allah to hasten for mankind the evil (they invoke for themselves and for their children, etc. while in a state of anger) as He hastens for them the good (they invoke) then they would have been ruined. So We leave those who expect not their meeting with Us, in their trespasses, wandering blindly in distraction.

Hazrat Abu Hurairah (May Allah be pleased with him) reported: Messenger of Allah  [SAWW](PBUH) said, "Remember more often the destroyer of pleasures - death.'' [At-Tirmidhi Hadith # 2307].  

Lesson : as mentioned above in Surah Yunus Ayat 11. We leave those who expect not their meeting with Us in their trespasses, wandering blindly in distraction". This Hadith tells us about being heedful and talking about death checks man from being lost in the worldly pleasures and seductions. We are, therefore, supposed to remember death frequently and to avoid remaining indifferent to post-death affairs and occurrences.