Let’s say it’s a beautiful day outside and you’re taking a stroll in the park. You study your shadow, and you notice just how much it looks like you. It’s an image of you. It’s connected to you. You start to run, and it follows you. It does what you do. Your shadow is affixed to you. Your shadow cannot be detached from you . . . unless you’re Peter Pan. Keith Mathison uses this helpful illustration in his little book titled The Lord’s Supper to explain the spiritual presence of...