Em Griffin, The Mindchangers, Tyndale House, 1976, p. 16.
There's a story about a kindergarten teacher who asked a boy what he was drawing. Without pausing to look up, he said, "A picture of God." The teacher smiled and responded, "But nobody knows what God looks like." The boy carefully put down his crayon, looked her squarely in the eye, and declared, "After I'm finished here they will."