To be complete is not just to be full with physical things, but also to be full in the mind. It is not to experience anything lacking, but to experience having everything. It is to be content even in situations where there might be something lacking physically.
If we ever find our self feeling something lacking in our life, we only have to tune our self to think what we have instead of thinking what we don’t have. When we begin to appreciate what we have we will not want anything, but will be able to appreciate and make use of everything that comes our way.