اقْتَرَبَ لِلنَّاسِ حِسَـبُهُمْ وَهُمْ فِى غَفْلَةٍ مُّعْرِضُونَ - مَا يَأْتِيهِمْ مِّن ذِكْرٍ مِّن رَّبِّهِمْ مُّحْدَثٍ إِلاَّ اسْتَمَعُوهُ وَهُمْ يَلْعَبُونَ
1. Draws near(closer and closer) for mankind their reckoning, while they turn away in heedlessness.
2. Comes not unto them an admonition from their Lord as a recent revelation but they listen to it while they play.
This is a warning from Allah SWT of the approach of the Hour, and that people are heedless of it, that is, we are not really preparing for it. Allah warns us of what one will have to face on the Day of Reckoning, in many places in the Qur'an. But we take it lightly. We are blinded by the temporary pleasures of this world, and almost forget to think about death and Hereafter.
We should all hasten to come back to the right track, on the Sirathul Musthaqueem, and stick to this path, the path of the rightly guided ones. We do not know the time of our death, and so we cannot delay in becoming closer to Allah SWT and thus, Jannah. We cannot afford to postpone our good deeds.