But we have this treasure in earthen vessels, that the excellency of the power may be of God, and not of us. (KJV) (2 Corinthians 4:7)
The light shining in our hearts is the news that Jesus Christ is our Lord. We are charged with the task of showing the world how Christ has changed us. However, when we show these great abilities over time, it is easy to get puffed up and think we are the ones who are responsible for the greatness. Rather, it is important to stay connected to God and always remember He is the ultimate source of power.