It may be the language they speak, their customs, their physical characteristics, even their style or manner of dress.
وَعِنْدَمَا نَتَعَلَّمُ أَنْ نَغُضَّ ٱلطَّرْفَ عَنْ هذِهِ ٱلِٱخْتِلَافَاتِ ،‏ لَا يَعُودُ ٱلْآخَرُونَ غُرَبَاءَ فِي نَظَرِنَا .‏