Engrossment in Dunya leads to Ghaflat
Aayaat 33 to 39 of Surah Zukhruf
وَلَوْلَا أَن يَكُونَ النَّاسُ أُمَّةً وَاحِدَةً لَّجَعَلْنَا لِمَن يَكْفُرُ بِالرَّحْمَٰنِ لِبُيُوتِهِمْ سُقُفًا مِّن فِضَّةٍ وَمَعَارِجَ عَلَيْهَا يَظْهَرُونَ( الى اية ٣٩)
If it were not that, mankind would become a single nation upon disbelief, we would have given those who disbelieve in Rahmaan such wealth that their homes would have had roofs of pure silver, the staircases leading up to the upper level, also pure silver. Their doors, also, their couches, of gold and silver. But all of this is the commodities of this world.( ie.of no value).That person who will turn a blind eye upon the advice of Rahmaan, we will appoint a devil over him, who will mislead him and he will feel he is rightly guided(He will think I am okay, I am a good Muslim, I carry out some charity works etc) Until he will come to us. Then the reality will dawn. He will wish that he could be distanced from that devil like the east and west. This feeling bad at that time etc will be of no avail.
We have life, and the opportunity to benefit from the Ulema and the works of deen. What excuse do we have as to why we did not take advantage of these opportunities to disconnect from the world and to connect with Allah Taala? Death can come at anytime. There will be no opportunities, only consequences. Allah Taala give us all Taufeeq.