AN EXCHANGE says: A man crossed the Mississippi river on the ice, and fearing it was too thin, began to crawl over on his hands and knees in great terror, but just as he gained the opposite shore, all tired out, another man drove past him gayly sitting upon a sled loaded with pig-iron. And for all the world that is just the way most of Christians go to the heavenly Canaan, trembling at every step, lest the promises shall break under our feet, when really they are secure enough for us to hold up our heads and sing with confidence as we march to the better land.