This was something new that they had to accept as true. Such ones can be likened to a sick man who was unaware of his illness.
وَبِمَا أَنَّ أَحَدًا لَمْ يُشَخِّصْ مُشْكِلَتَهُ بِٱلتَّحْدِيدِ فَهُوَ يَظُنَّ أَنَّهُ يَتَمَتَّعُ بِصِحَّةٍ جَيِّدَةٍ ،‏ إِلَّا أَنَّ ذلِكَ لَا يُغَيِّرُ وَاقِعَ كَوْنِهِ مَرِيضًا .‏ ‏