And now have we set before men, in this Koran, every kind of parable: yet if thou bring them a single verse of it, the infidels will surely say, “Ye are only utterers of vain things.”

It is thus that God hath sealed up the hearts of those who are devoid of knowledge.

But do thou, Muhammad, bear with patience, for true is the promise of God; and let not those who have no firm belief, unsettle thee.