“Musa ibn Ja’far (s) was shown into the presence of Ar-Rashid. Then Ar-Rashid told him, “O son of the Prophet of God! Tell me about the four kinds of temperaments.” Then Musa (s) told him, “The wind which is a king who puts up with his people and treats them gently. Then there is blood that is like a servant who incurs a loss that often kills his master. And there is phlegm that is a hard enemy. Whichever way you block it, it will find another way. Andthere is ‘Safra which is like the earth that will make everything on it grow.” Then Harun asked him, “O son of the Prophet of God! Do you bestow upon the people gifts from the Treasures of God and His Messenger?”