تِلْكَ الْقُرَىٰ نَقُصُّ عَلَيْكَ مِنْ أَنبَائِهَا ۚ وَلَقَدْ جَاءَتْهُمْ رُسُلُهُم بِالْبَيِّنَاتِ فَمَا كَانُوا لِيُؤْمِنُوا بِمَا كَذَّبُوا مِن قَبْلُ ۚ كَذَٰلِكَ يَطْبَعُ اللَّهُ عَلَىٰ قُلُوبِ الْكَافِرِينَ (101)
(7:101) To those [earlier] communities - some of whose stories We relate to you - there had indeed come Messengers with clear proofs, but they would not believe what they had once rejected as false. Thus it is that Allah seals the hearts of those who deny the truth. *81
*81). The purpose behind the 'sealing of hearts' mentioned in the preceding verse is also explained in the present verse. It is clear from the two verses that the 'sealing of hearts' means that man's capacity to hear and understand the truth is seriously, impaired because of the operation of natural, psychological laws. Because of these laws, once a person turns away from the truth because of his irrational prejudices and the dominance of lust, he becomes enmeshed in his own obstinacy and adamance. With the passage of time this adamance is compounded to such an extent that despite all rational and empirical evidence in support of the truth, he continues to reject it.