But if they (those who stray) then turn away, We have not sent you (O Prophet,) as a guard over them. Your duty is only to convey (the Message to them). And truly, when We give man a taste of a Mercy from Ourselves, he does feel very happy with it, but when some ill happens to him, on account of the deeds which his hands have sent forth, (or because of what he himself has done) then truly, is man ungrateful!