al-Sharif al-Radi (d. 406 AH) · Thaqalayn library edition, reproduced verbatim
[صعوبة الإيمان :] إِنَّ أَمْرَنا صَعْبٌ مُسْتَصْعَبٌ، لاَ يَحْتَمِلُهُ إِلاَّ عَبْدٌ مُؤْمِنٌ امْتَحَنَ اللهُ قَلْبَهُ لِلاِيمَانِ، وَلاَ يَعِي حَدِيثَنَا إِلاَّ صُدُورٌ أَمِينَةٌ، وَأَحْلاَمٌ رَزِينَةٌ.
[Arduousness of belief :] Certainly, our case is difficult and complicated. No one can bear it except a believer whose heart Allāh has tried with belief. Our traditions will not be preserved except by trustworthy hearts and (men of) solid understanding.
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