You are reading a tafsir for the group of verses 6:109 to 6:110
وَاَقْسَمُوْا
بِاللّٰهِ
جَهْدَ
اَیْمَانِهِمْ
لَىِٕنْ
جَآءَتْهُمْ
اٰیَةٌ
لَّیُؤْمِنُنَّ
بِهَا ؕ
قُلْ
اِنَّمَا
الْاٰیٰتُ
عِنْدَ
اللّٰهِ
وَمَا
یُشْعِرُكُمْ ۙ
اَنَّهَاۤ
اِذَا
جَآءَتْ
لَا
یُؤْمِنُوْنَ
۟
وَنُقَلِّبُ
اَفْـِٕدَتَهُمْ
وَاَبْصَارَهُمْ
كَمَا
لَمْ
یُؤْمِنُوْا
بِهٖۤ
اَوَّلَ
مَرَّةٍ
وَّنَذَرُهُمْ
فِیْ
طُغْیَانِهِمْ
یَعْمَهُوْنَ
۟۠
3

The truth may be laid before a man with all its supporting arguments and he will still reject it. There is just one reason for this, i.e. his looking at things perversely instead of looking at them in a straightforward manner. An argument may be most rational and based on sound reasoning, but if one is not inclined to accept it, he will find some words or the other to reject it. For example, instead of viewing the arguments of a preacher as definitive, he will start discussing whether all the previous great men were all wrong and strangers to the Truth, and will go on to raise other similar points. It is extremely difficult for one who has developed such a temperament to arrive at the right path. He can give the wrong colour to any subject and seek an excuse to reject it. In order to contradict theoretical arguments, he will find the excuse that they were against the creed of his ancestors. Similarly, in order to allege the falsity of physical observations, he will voice the opinion that they are optical illusions or mere conjuring tricks. This attitude, which impedes the acceptance of theoretical arguments, will likewise obstruct the acceptance of physical facts in support of the truth. One who is determined to remain unreceptive to the truth will, as always, have to go without guidance. Such deniers are arrogant in nature. They want to see themselves set above others at any cost. When a preacher appears before them with a message of Truth, it frequently happens that he is a stranger in those surroundings and has none of the elegant trappings of the times. So, forming any connection with him amounts to degrading one’s position. Those with a superiority complex are therefore unable to accept him. Offering a variety of excuses, they reject him.