We are being conformed to the image of Jesus, measuring spiritual growth is important; it must be measured in the Spirit.

The Spirit is not objective (we can’t see Him) so we cannot measure growth only by behavior, we should learn the heart.
Jesus is our example that we should follow in this world. He said that we are sent just as the Father sends him.
We are more than Representatives: Although we are ambassadors, we are more; we are in fact Christ in the world. With the same commission and power we can do the fathers work just like Jesus did. He prayed in John 17 for us to be one in Him even as He is one with the father. Jesus in the father, the Father in Him, Jesus in us and we in Him and the Father. When those in Christ come on the scene the kingdom of God has, just as in the days of Christ, come near.