As long as you base your life on wealth, property and worldly things, you will never be able to derive any real joy.
External freedom speaks of independence, being free of external bonds and limitations.
Inner freedom speaks of liberation from the bondage of the senses, having them under your full control. Every individual should realize both of these freedoms. In the external world, as long as you are under the control of people who are unsympathetic towards you, such as some foreign king or ruler, you will not be able to get real joy. In the inner world, as long as you are a slave of the senses, then you will also not be able to enjoy real freedom. Even for the outer freedom, sense-control is important.