32-11 (The author of the book narrated) my father - may God be pleased with him - narrated that Sa’d ibn Abdullah quoted on the authority of Ahmad ibn Abi Abdillah, on the authority of someone else, on the authority of Abi Tahir ibn Abi Hamza that Abil Hassan Ar-Ridha’ said, “There are four kinds of temperaments. One is phlegm that is a stubborn enemy. Then there is blood which is like Ethiopian servants who often kill their masters. The third one is the wind which is a king who puts up with his people and treats them gently. The last one is ‘Safra which is like the Earthquake which will make everything on the Earth tremble when it occurs.’”