Inner serenity is reflected in your outer being. How is this possible? Your mind is the intermediary between the outer world and the inner world. Whatever arises from within is projected outward and what is experienced outwards is received within.
Therefore, all your experiences can only point to the one self within that is the cause of the mind. And all causal impulses express nothing other than your pure inner self.
The cause of strive in this world is rooted not in the self, but in the patterns of the mind that have been established over the years. Look at these patterns with love and you will realize that they are crutches that you needed in order to cope with the challenges of life. Throw them away now that you want to live in freedom and be free, be liberated.