You don't listen when your heart is full of anger. Anger destroys everything inside and you lose touch of the little holy prophesy. The Isbitzer says we must cleanse ourselves of anger. To cleanse myself from angerI have to start first to fill my heart with joy. Only a heart that is full of joy can be void of anger.
Anger destroys everything in the world.
It is hard to tear out anger from your heart. Imagine you wipe out Amalak, that you have cleansed yourself of anger. Israel is only given to us completely when we have cleansed ourselves from anger. Anger is still evident in Yerushalyim. Cleanse yourself from anger at the Holy Wall.