﴿ أَوْ تَقُولُوا۟ لَوْ أَنَّآ أُنزِلَ عَلَيْنَا ٱلْكِتَٰبُ لَكُنَّآ أَهْدَىٰ مِنْهُمْ ۚ فَقَدْ جَآءَكُم بَيِّنَةٌۭ مِّن رَّبِّكُمْ وَهُدًۭى وَرَحْمَةٌۭ ۚ فَمَنْ أَظْلَمُ مِمَّن كَذَّبَ بِـَٔايَٰتِ ٱللَّهِ وَصَدَفَ عَنْهَا ۗ سَنَجْزِى ٱلَّذِينَ يَصْدِفُونَ عَنْ ءَايَٰتِنَا سُوٓءَ ٱلْعَذَابِ بِمَا كَانُوا۟ يَصْدِفُونَ ﴾

“or lest you say, "If a divine writ had been bestowed from on high upon us, we would surely have followed its guidance better than they did." And so, a clear evidence of the truth has now come unto you from your Sustainer, and guidance, and grace. Who, then, could be more wicked than he who gives the lie to God's messages, and turns away from them in disdain? We shall requite those who turn away from Our messages in disdain with evil suffering for having thus turned away!”

The Book which is revealed on behalf of God contains many details, but its purpose is but one and that is that man should firmly believe that he has to face God. In other words, he should spend life in the world in such a way that he should always treat himself as being answerable to God for his each and every action. His life should be a responsible life and not a free and unrestricted life. This was the purpose of previous Books and this is likewise the aim of the Quran. God has given full freedom to human beings, while keeping the rest of the world under His direct orders and subject to His regulation. The method devised by Him for human guidance is to make people aware of Truth and falsehood through the Prophets as well as His Books which are couched in the language of reason.In the world, God’s will appears before the people in the shape of reasoning. Here, acceptance of this reasoning means acceptance of God and rejection of this reasoning amounts to rejection of God.