Just as certain metals tend to rust, imperfect humans have a tendency to complain. We should be on guard to detect any sign of this.
وَلٰكِنْ كَيْفَ يُمْكِنُنَا تَطْبِيقُ هٰذَا ٱلْمَثَلِ عَلَى ٱلتَّذَمُّرِ ؟‏