Surah No. 10, Yunus, Ayat No. 99 &100
وَلَوْ شَاء رَبُّكَ لآمَنَ مَن فِي الأَرْضِ كُلُّهُمْ جَمِيعًا أَفَأَنتَ تُكْرِهُ النَّاسَ حَتَّى
وَمَا كَانَ لِنَفْسٍ أَن تُؤْمِنَ إِلاَّ بِإِذْنِ اللّهِ وَيَجْعَلُ الرِّجْسَ o يَكُونُواْ مُؤْمِنِينَ
o عَلَى الَّذِينَ لاَ يَعْقِلُونَ
If it had been the Lord's Will, all of them who are on the earth would have believed together! (O Mohammad) you still compel mankind against their will to believe!
No soul can believe except by the Will of Allah and He will place doubts on those who will not understand.
Surah No.16, An Nahl, Ayat No. 93
وَلَوْ شَاء اللّهُ لَجَعَلَكُمْ أُمَّةً وَاحِدَةً وَلكِن يُضِلُّ مَن يَشَاء وَيَهْدِي مَن يَشَاء
o وَلَتُسْأَلُنَّ عَمَّا كُنتُمْ تَعْمَلُونَ
If Allah so willed, He would have made you all one community : but He leaves straying whom He wills and He guides whom He pleases: but you shall certainly be called to account for what you have been doing.