One of the best truths of the Gospel is that Jesus lives in our heart. What we mean by this is that He sent His Holy Spirit to dwell in us and so that from the inside out He can change us more and more into looking and talking and acting like Jesus.
But it is important to know HOW Jesus lives inside of us. It isn’t because of your last name, or because your Grandpa was a pastor, or you have enough quarters in your piggy bank, or because you tell really funny jokes, or because you have lots of verses memorized.
Jesus lives in your heart by faith. That means that you don’t look at how good you are, but you look to His promise to forgive your sins as the only way to be saved from the punishment of your sins.