human weakness and inconstancy

وَلَئِنْ أَرْسَلْنَا رِيحًا فَرَأَوْهُ مُصْفَرًّا لَّظَلُّوا۟ مِنۢ بَعْدِهِۦ يَكْفُرُونَ

But if We should send a [bad] wind and they saw [their crops] turned yellow, they would remain thereafter disbelievers.