Imagine this as the acid test for Christian discipleship: "I am in earnest about forsaking 'the world' and following Christ. But I am puzzled about worldly things. What is it I must forsake?" a young man asks. "Colored clothes, for one thing. Get rid of everything in your wardrobe that is not white. Stop sleeping on a soft pillow. Sell your musical instruments and don't eat any more white bread. You cannot, if you are sincere about obeyin…