We need to constantly renew in the spirit of your mind, and put on the new man, who in the likeness of God has been created in righteousness and holiness of truth
If we never stop following Jesus, He will change us making those changes more and more obvious in our lives and for the people around us.
The fact that we have become believers yet doesn´t mean we have become perfect. That´s why we should not represent ourselves as such in front of other people. Surely we are not perfect. We are still undergoing improvement process. We are still under process of changes as we follow Jesus and submit ourselves to His Spirit. God changes us as we renew our mind and put aside our old man, as we deny ourselves and carry the cross. All these things have an impact on us helping us to behold the glory of the Lord.