[5/5] Usul al-Kafi: Ali from his father (Ibrahim b. Hashim) from Abi Hashim al-Ja’fari who said: We were with al-Ridha عليه السلام when we began discussing about the intellect and moral virtue, so he said: O Abu Hashim, intellect is a free gift from Allāh while virtue is an effortful acquisition, whoever strives to acquire virtue is able to possess it but whoever strives to acquire intellect he achieves naught by that except further ignorance.

 
[5/5] اصول الكافي: علي، عن أبيه، عن أبي هاشم الجعفري قال: كنا عند الرضا عليه السلام فتذاكرنا العقل والادب فقال: يا أبا هاشم العقل حباء من الله والادب كلفة، فمن تكلف الادب قدر عليه، ومن تكلف العقل لم يزدد بذلك إلا جهلا