Lyric discussion by Tourniquet_fauns 

I think it means that believers have this joy that radiates within and though we look no different than others when we smile theres something different about us. Theres a twinkle in our eye and just this joy that radiates and draws people to us. It changes a person and they are no longer the same. He smiles at her and she smiles back and they both realize that they are christians.

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