Surah Ash Shu'ara Tafseer

If We will, We could send down to them from the heaven a sign, to which they would bend their necks in humility.

meaning, `if We so willed, We could send down a sign that would force them to believe, but We will not do that because We do not want anyone to believe except by choice.'

Allah says:

وَلَوْ شَأءَ رَبُّكَ لامَنَ مَن فِى الاٌّرْضِ كُلُّهُمْ جَمِيعًا أَفَأَنتَ تُكْرِهُ النَّاسَ حَتَّى يَكُونُواْ مُوْمِنِينَ

And had your Lord willed, those on earth would have believed, all of them together. So, will you then compel mankind, until they become believers. (10:99)

وَلَوْ شَأءَ رَبُّكَ لَجَعَلَ النَّاسَ أُمَّةً وَاحِدَةً

And if your Lord had so willed, He could surely, have made mankind one Ummah... (11:118)

But Allah's will has acted, His decree has come to pass, and His proof has been conveyed to mankind by mission of Messengers and the revelation of Books to them.

Then Allah says:

وَمَا يَأْتِيهِم مِّن ذِكْرٍ مِّنَ الرَّحْمَنِ مُحْدَثٍ إِلاَّ كَانُوا عَنْهُ مُعْرِضِينَ