The poet mentioned two kinds of anger: anger with friends and snger with enemies. When he was angry with his friends,he could stop his anger. In contrast,when he was angry with his enemies,he could not stop. The anger gradually grew up because he kept it in mind and waited for a revenge. He fed the anger like a poison tree. The poison tree was fed with water,synbolized fear and tear. He sunned it with smailes and soft deceitful words. It seemed that he pretended to be friends. The poison tree later bore such charming fruit that the enemy stole and ate of it and died at last. We could imply that it was the time to talk
revenge when his anger was about to burst out.