Weary travelers. You've seen them -- everything they own crammed into their luggage. Staggering through terminals and hotel lobbies with overstuffed suitcases, trunks, duffels, and backpacks. Backs ache. Feet burn. Eyelids droop. We've all seen people like that. At times, we are people like that -- if not with our physical luggage, then at least with our spiritual load. We all lug loads we were never intended to carry. Fear. Worry. Discontent. No...