What does Tom do when he begins to regret his bargain with the devil?

Tom Walker sells his soul to the devil in exchange for great wealth in the form of buried treasure.  As part of the deal he must be employed in his lifetime in the devil's service, and to do this he chooses to become a money-lender, "cheating people out of their money and charging them outrageous interest".  As Tom grows old, he begins to worry about the terms of the agreement he has made, and tries to cheat the devil out of taking his soul.  In order to do this he suddenly becomes an avid church-goer who reads the Bible "obsessively" and prays loudly in church so that everyone can hear.  His efforts are to no avail, however, and the devil comes one day and takes Tom away on a black horse.  He is never seen again.