They are important because it shows the character's true self, and
lets the audience understand what he is thinking. It also serves as
story telling because this is suppose it be play, it's more
interesting than someone just telling what happens.
One theme I got was the struggle within himself. Because his mom
married his uncle he is suppose to respect him as king, but at the
same time he doesn't want to because he thinks their marriage is
disgusting and he still has much loyalty to his dad.