I heard a youth speaker once talking about his 4 yr old daughter, and how she knew just how big God is. And she knew that He lived in her heart, but she was baffled, and asked her dad..."If God lives in my heart, and is sooo big...wouldn't He stick out all over?" Her dad laughed at first, then replied..."yes, yes He would." If Jesus lives inside your heart, people will know it because He will shine through you.