The Jews in their arrogance, claimed to have the whole wisdom and divine knowledge; but their claim was void of any truth and was rooted in their arrogance and blasphemy. QURÄN reveals their state of mind saying: ``They say our hearts is covered in the sheath and we don't follow what you mean.'' And indeed it was so, for God had cursed them for their arrogance and blasphemy, turning them away from HIS MERCY.