Imam al-Kazim (AS) in his advice to Hisham b. al-Hakam, said, ‘Allah has only sent His prophets and messengers to His servants in order that they may come to an understanding of Allah, so the ones who best heed their call are those who have the best inner knowledge, and the ones who know Allah s command the best are those that have the best intellects, and those that have the most perfect intellects will be the ones with the highest status in this world and in the Hereafter.