Ephesians 4:1

So I, the prisoner for the Lord, appeal to you to live a life worthy of the calling to which you have been called (that is, to live a life that exhibits godly character, moral courage, personal integrity, and mature behavior-a life that expresses gratitude to God for your salvation).

If we are surface Christians, we will not be mindful of what we say, act, or do. In short, we will behave just like the world. We are to exhibit godly character, moral courage, personal integrity, and mature behavior. A person seeking salvation needs to see our representation as authentic. Otherwise, salvation and Jesus will not represent a better way.