وَاعْلَمْ يَا بُنَيَّ أَنَّهُ لَوْ كَانَ لِرَبِّكَ شَرِيكٌ لَأَتَتْكَ رُسُلُهُ، وَلَرَأَيْتَ آثَارَ مُلْكِهِ وَسُلْطَانِهِ، وَلَعَرَفْتَ أَفْعَالَهُ وَصِفَاتَهُ، وَلكِنَّهُ إِلهٌ وَاحِدٌ كَمَا وَصَفَ نَفْسَهُ، لَا يُضَادُّهُ فِي مُلْكِهِ أَحَدٌ، وَلَا يَزُولُ أَبَداً وَلَمْ يَزَلْ. أَوَّلٌ قَبْلَ الْأَشْيَاءِ بِلاَ أَوَّلِيَّةٍ، وَآخِرٌ بَعْدَ الْأَشْيَاءِ بِلاَ نِهَايَةٍ. عَظُمَ عَنْ أَنْ تَثْبُتَ رُبُوبِيَّتُهُ بِإِحَاطَةِ قَلْبٍ أَوْ بَصَرٍ. فَإِذَا عَرَفْتَ ذلِكَ فَافْعَلْ كَمَا يَنْبَغِي لِمِثْلِكَ أَنْ يَفْعَلَهُ فِي صِغَرِ خَطَرِهِ، وَقِلَّةِ مَقْدِرَتِهِ، وَكَثْرَةِ عَجْزِهِ، وَعَظِيمِ حَاجَتِهِ إِلَى رَبِّهِ، فِي طَلَبِ طَاعَتِهِ، وَالْخَشْيَةِ مِنْ عُقُوبَتِهِ، وَالشَّفَقَةِ مِنْ سُخْطِهِ، فَإِنَّهُ لَمْ يَأْمُرْكَ إِلَّا بِحَسَنٍ، وَلَمْ يَنْهَكَ إِلَّا عَنْ قَبِيحٍ.
Know O my child, if there had been a partner with your Lord, his messengers too should have come to you and you would have seen signs of his authority and power and have known his deeds and qualities. But He is only One God as He has described Himself. No one can dispute with Him in His authority. He is from ever and will be for ever. He is before all things without any beginning. He will remain after all things without any end. He is far too great to have His divinity proved by the encompassing heart or eye. When you have understood this then you should do what is done by him who is like you by way of his low position, his lack of authority, his increasing incapability, and his great need of his Lord for seeking His obedience, fearing His chastisement and apprehending His anger, because He does not command you save for virtue and does not refrain you save from evil.