Object Lesson: Knots in a Rope Shorten its Length like Bitterness Shortens Potential

Take rope 1 foot long and show its length. Then proceed to tie knots up and down its length and measure it again and show how it is half its length. Explain that every knot is like a conflict that was never forgiven or a place in someone's life where bitterness has grown. Explain that bitterness shortens our potential, etc.