Imam Muhammad al-Baqir (as): O Hisham, The Commander of the faithful used to say: God is not worshipped through anything better than the intellect, and man's intellect will not be perfect until he possesses different qualities: disbelief and evil are far from him, development and goodness are expected from him, he gives away the excess of his wealth and restrains the excess of his speech, his share from this world is that which is enough to maintain him, he is never satiated with knowledge throughout his life, and prefers lowliness when being with God to honor when being with other than Him, humbleness is more loved by him than dignity, he regards the little good done by others as being much and regards the abundance of good that he himself does as being little, he considers all people to be better than him and considers himself to be worse than them. al-Kāfī