Paul is talking to Timothy and letting him know his responsibility to grow and develop his faith. We must work on our heart and making a change from non-believer to new believer and from new believer to mature follower of Christ. We can’t just be Christians, it doesn’t mean anything if we are not learning and maturing to be Christ-like. Christian is a word that means something. It means we believe in Jesus Christ and we desire to be like Him in our behavior.
Look at what Paul says in Romans chapter 2 verses 28-29, “For you are not a true Jew just because you were born of Jewish parents or because you have gone through the ceremony of circumcision. No, a true Jew is one whose heart is right with God. And true circumcision is not merely obeying the letter of the law; rather, it is a change of heart produced by God’s Spirit. And a person with a changed heart seeks praise from God not from people.”
This is exactly what has to happen to be a Christian also. We have got to have a changed heart that we fill with God’s Spirit and we must long for praise from God, like wanting to hear “well done good and faithful servant.” We are loved and that is why it is so important for us to understand what God says about us and make a difference in the world, shining for people to see that we are Christians. Amen