Positional truth is our status quo before God in Christ. We hold the same status that Jesus enjoys before the Father. A life that pleases God is one of maturity. Paul asks his audience to walk with him in the objective of Christlikeness. His goal for himself was his goal for them.
Verse twelve conveys the idea of sinless perfection.
He insists he never attained that. In this verse he uses the a similar term in the sense of spiritual adulthood, spiritual maturity. When a person is first born into the family of God he has life and that is all. He knows nothing about how to live the Christian life. He does not even know everything there is to know about his birth.