So if they fail to respond to you, then know that they only follow their desires. And who could be more astray than those who follow their desires with no guidance from Allah? Surely Allah does not guide the wrongdoing people.

But if they answer you not (i.e. do not bring the Book nor believe in your doctrine of Islâmic Monotheism), then know that they only follow their own lusts. And who is more astray than one who follows his own lusts, without guidance from Allâh? Verily Allâh guides not the people who are Zâlimûn (wrong-doers, disobedient to Allâh, and polytheists).