There is no action after understanding.
Understanding is the action itself.
It is not that you bring the light inside the room, then you throw the darkness out. You don't say, “I will bring the lamp in and then throw the darkness out.” If you say that, anybody will know that you are blind. You don't know what you are saying. When you bring light in you will not find darkness at all. What are you going to throw out?
Understanding is light.
The moment you understand, there is no suffering to be thrown out, to be dropped, to be got rid of.
Understanding simply cleanses you.
You may have a laugh after it, but there is no action. You may have a good laugh because you will see how stupid you have been. You have been trying to get rid of things which only need to be understood, and that very understanding becomes freedom from them.
No doing other than understanding is needed.