"The Day it comes no soul will speak except by His permission. Among them (mankind) are the fortunate (those destined for Jannah) and the unfortunate (those destined for Jahannam)." (11:105)
In these verses, Allaah informed Rasulullaah (sallallaahu 'alaihi wa sallam) that people will accept Imaan only if the good fortune of doing so has been destined for them in the Lowhul Mahfoodh. Similarly, only those people for whom ill-fortune has been destined in the Lowhul Mahfoodh will go astray. Allaah then revealed to Rasulullaah (sallallaahu 'alaihi wa sallam):
"(O Rasuluflaah sallallaahu 'alaihi wa sallam) It seems like you will destroy yourself (with grief) because they (the Kuffaar) are not becoming Mu'mineen. If We willed, We could have revealed a (great) Aayah (miracle) to them from the sky, causing their necks to bow before it in humility (because of which they would be forced to accept Imaan. However, Allaah does not do this because forcing people into submission would defeat the object of testing them and rewarding or punishing them according to their merit)." (26:3-4)
[Tabraani. Haythami states that the narrators of this Hadith are reliable, but adds that Ali bin Abi Talha did not hear the Hadeeth directly from Hadhrat Abdullaah ibn Abbaas radiallaahu 'anh]