"venom of your spleen"
Language
Act 4,
Scene 2
Lines 91-102a
Brutus
Cassius
Brutus
Going all the way back to the ancient Greeks, it was believed that the black bile secreted by the spleen was the cause of foul temper. This belief is still reflected in the modern expression, "to vent your spleen on someone." Brutus is not going to let Cassius vent his spleen on him; whenever Cassius is in a bad mood, Brutus is just going to laugh it off.