أَمْ يَقُولُونَ افْتَرَى عَلَى اللَّهِ كَذِبًا فَإِن يَشَأِ اللَّهُ يَخْتِمْ عَلَى قَلْبِكَOr say they:"He has invented a lie against Allah!" If Allah willed, He could have sealed up your heart.means, `if you had invented any lies against Him, as these ignorant people claim,' يَخْتِمْ عَلَى قَلْبِكَ (He could have sealed up your heart).means, `and thus caused you to forget what had already come to you of the Qur'an.'This is like the Ayah:وَلَوْ تَقَوَّلَ عَلَيْنَا بَعْضَ الاٌّقَاوِيلِلاأَخَذْنَا مِنْهُ بِالْيَمِينِثُمَّ لَقَطَعْنَا مِنْهُ الْوَتِينَفَمَا مِنكُم مِّنْ أَحَدٍ عَنْهُ حَـجِزِينَAnd if he had forged a false saying concerning Us (Allah), We surely would have seized him by his right hand, and then We certainly would have cut off his life artery, And none of you could have withheld Us from (punishing) him. (69:44-47)which means, `We would have wrought the utmost vengeance upon him, and no one among mankind would have been able to protect him.'And Allah said:وَيَمْحُ اللَّهُ الْبَاطِلَAnd Allah wipes out falsehood,وَيُحِقُّ الْحَقَّ بِكَلِمَاتِهِand establishes the truth by His Word.means, He establishes it and strengthens it and makes it clear by His Words, i.e., by His evidence and signs.إِنَّهُ عَلِيمٌ بِذَاتِ الصُّدُورِVerily, He knows well what are in the breasts.means, all that is hidden in the hearts of men