“ The shrewd one ” might reason: ‘ He says that this vitamin, herb, or diet supposedly helped someone, but are there adequate witnesses to establish the matter? People differ.
وَبِمَا أَنَّ ٱلْأَجْسَامَ تَخْتَلِفُ ،‏ فَكَيْفَ أَعْرِفُ أَنَّهَا سَتُفِيدُنِي أَنَا أَيْضًا ؟‏