Read and reflect on verse 1320 from Surah At-Tawba: And let not their worldly goods and [the happiness which they may derive from] their children excite thy admiration: God but wants to chastise them by...
وَلَا تُعْجِبْكَ أَمْوَالُهُمْ وَأَوْلَادُهُمْ ۚ إِنَّمَا يُرِيدُ اللَّهُ أَنْ يُعَذِّبَهُمْ بِهَا فِي الدُّنْيَا وَتَزْهَقَ أَنْفُسُهُمْ وَهُمْ كَافِرُونَ
And let not their worldly goods and [the happiness which they may derive from] their children excite thy admiration: God but wants to chastise them by these means in [the life of] this world, and [to cause] their souls to depart while they are [still] denying the truth.