﴿ إِنَّ ٱلَّذِينَ كَفَرُوا۟ وَصَدُّوا۟ عَن سَبِيلِ ٱللَّهِ وَشَآقُّوا۟ ٱلرَّسُولَ مِنۢ بَعْدِ مَا تَبَيَّنَ لَهُمُ ٱلْهُدَىٰ لَن يَضُرُّوا۟ ٱللَّهَ شَيْـًۭٔا وَسَيُحْبِطُ أَعْمَٰلَهُمْ ﴾

“Verily, they who are bent on denying the truth and on barring [others] from the path of God, and [who thus] cut themselves off from the Apostle after guidance has been vouchsafed to them, can in no wise harm God; but He will cause all their deeds to come to nought.”

When a man struggles for the cause of religion, he has to undergo different experiences, which are a test of his Faith: he must prove his steadfastness of belief by making sacrifices, crush his self, ignore his material interests, tolerate harassment; and remain steadfast in his devotion to God, even at the cost of his life and property. In order to place the believer in such circumstances, it is necessary for non-believers to have full freedom, so that they may indulge in all sorts of activities against the people of Faith. These activities, on the one hand, establish the guilt of opponents beyond doubt and, on the other, give the opportunity to the people of Faith to show that, by being steadfast in their Faith under the most trying circumstances, they are real believers and are entitled to be selected for the eternal afterlife in God’s ideal world.