وَلَوۡ شَآءَ رَبُّكَ لَجَعَلَ ٱلنَّاسَ أُمَّةٗ وَٰحِدَةٗۖ وَلَا يَزَالُونَ مُخۡتَلِفِينَ
And if your Lord had (so) decided, He would indeed have made mankind one nation; and (i.e., but) they do not cease differing (among themselves)
Author: Muhammad Mahmoud Ghali