Is Jesus walking around in there?

While putting Finn to bed last night, he told me that Jesus is in his heart.  He then asked, "where's my heart again?"  He thought about this for a moment, with his hand against his chest, trying to feel Jesus, presumably.  Then he asked, "Is he walking around in my heart?  I can't feel him."  Finn also began to explore the complexities of Jesus, saying, "Maybe he's not in my heart.  He's in the sky with God."  A lot to think about for my little three-and-a-half-year-old.