al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
فَاللهَ اللهَ فِي نَفْسِكَ! فَإِنَّكَ ـ وَاللهِ ـ مَا تُبَصَّرُ مِنْ عَمىً، وَلاَ تُعَلّمُ مِنْ جَهْل، وَإِنَّ الْطُّرُقَ لَوَاضِحَةٌ، وَإِنَّ أَعْلاَمَ الدِّينِ لَقَائِمَةٌ. فَاعْلَمْ أَنَّ أَفْضَلَ عِبَادِاللهِ عِنْدَ اللهِ إِمَامٌ عَادِلٌ، هُدِيَ وَهَدَي، فَأَقَامَ سُنَّةً مَعْلُومَةً، وَأَمَاتَ بِدْعَةً مَجْهُولَةً، وَإِنَّ السُّنَنَ لَنَيِّرَةٌ، لَهَا أَعْلاَمٌ،
Then (fear) Allāh, in your own self; for, by Allāh, you are not being shown anything as if you are blind or being apprised of anything as if you are ignorant. The ways are clear while the banners of faith are fixed. You should know that among the creatures of Allāh, the most distinguished person before Allāh is the just Imām who has been guided (by Allāh) and guides others. So, he stands by the recognized ways of the Prophet’s behaviour and destroys unrecognized innovations. The (Prophet’s) ways are clear and they have signs, while innovations are also clear and they too have signs.
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