Two Requirements for Knowledge
It is reported that Al-Sha’bī said, “The only people who used to seek this knowledge were those who combined two characteristics: intelligence and devout worship. If a person was intelligent but not devout, it would be said that only the worshippers can attain this [knowledge], and so he would not try to seek it. And if a person was devout, but not intelligent, it would be said that only the intelligent can attain this [knowledge], and so he would not try to seek it.” Al-Sha’bī continued, “And I fear that today, people who are neither intelligent nor devout try to seek it.”
Ibn Ḥibbān Al-Bustī, Rawḍatu Al-‘Uqalā` wa Nuzhatu Al-Fuḍalā` Vol.1 p9.
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Related sayings.
The excellence of the scholars of the Salaf made them fit to be kings.
The status of personal opinion in the face of what has come from the Companions.