Read and reflect on verse 814 from Surah Al-An'aam: And there are among them such as [seem to] listen to thee [O Prophet]: but over their hearts We have laid veils which prevent them from grasping the t...
وَمِنْهُمْ مَنْ يَسْتَمِعُ إِلَيْكَ ۖ وَجَعَلْنَا عَلَىٰ قُلُوبِهِمْ أَكِنَّةً أَنْ يَفْقَهُوهُ وَفِي آذَانِهِمْ وَقْرًا ۚ وَإِنْ يَرَوْا كُلَّ آيَةٍ لَا يُؤْمِنُوا بِهَا ۚ حَتَّىٰ إِذَا جَاءُوكَ يُجَادِلُونَكَ يَقُولُ الَّذِينَ كَفَرُوا إِنْ هَٰذَا إِلَّا أَسَاطِيرُ الْأَوَّلِينَ
And there are among them such as [seem to] listen to thee [O Prophet]: but over their hearts We have laid veils which prevent them from grasping the truth, and into their ears, deafness. And were they to see every sign [of the truth], they would still not believe in it-so much so that when they come unto thee to contend with thee, those who are bent on denying the truth say, "This is nothing but fables of ancient times!"