A brother asked Abba Poeman

"What does it mean to be angry with your brother without a cause ?" He said, "If your brother hurts you by his arrogance and you are angry with him because of this, that is getting angry without a cause. If he pulls out your right eye and cuts off your right hand and you get angry with him, that is getting angry without a cause. But if he cuts you off from God--then you have every right to be angry with him."