 Of course it does not because what Jesus is talking here about, he's not talking about the pumping station you got here in your body. He's talking about something far different than that. The heart, according to the New Testament concept, is the center of your emotion, the center of your feeling, the center of your desires. It's where you make your plans and where you talk with yourself. Your heart is the emotional part of your being. So when you say to somebody,