You know the story. The famous Danish tale. The little duckling who is so ugly and of whom is made fun of by his siblings. Who is grey and clumsy. And one day he grows up. And he sees himself - gracious and beautiful and so much more majestic than he thought. Not at all what he sees around him or what those around him tell him, but his true self.
...I urge you to live a life worthy of the calling you have received ... become mature ... attaining to the whole measure of the fulness of Christ ... to become in every respect the mature body of him ... (Eph. 4:1, 13, 15)
Mature in Christ means knowing who we are in him, that the fulness of him dwells within us. No more an ugly duckling, but a majestic swan, sailing the seas and soaring on high.