Gwen's stocking up on school supplies, stuffing her backpack full of whatever she might need.  Even though it's super heavy by the time she's done, she doesn't want to leave any of it behind!  That's when Mr. Jacobs remembers a story about trusting in God over trusting in things...  (Scripture: Matthew 6; Luke 12; Colossians 3:2; Luke 3; 1st John 3)