Materialism and worldly preoccupation

إِنْ هِىَ إِلَّا حَيَاتُنَا ٱلدُّنْيَا نَمُوتُ وَنَحْيَا وَمَا نَحْنُ بِمَبْعُوثِينَ

It [i.e., life] is not but our worldly life - we die and live, but we will not be resurrected.