To live in our potential as a human being we must live in the Spirit. We are talking here of the Spirit of Christ. When filled with the Spirit in this sense we are filled with the Son of Man and He ignites our life. I use the word ignite because it is the Spirit of Christ who lights up our being. To live in the flesh is to live without the lights turned on. At best we never reach our potential. At worst our behavior tends to more animal than human. But we have a life that is Christ that enable us to live in the Spirit of Sonship as sons of God.