SELECTION FROM THE WESTMINSTER SHORTER CATECHISM Q. 39. What is the duty which God requireth of man? A. The duty which God requireth of man is obedience to his revealed will. Q. 40. What did God at first reveal to man for the rule of his obedience? A. The rule which God at first revealed to man for his obedience was the moral law. Q. 41. Where is the moral law summarily comprehended? A. The moral law is summarily comprehended in the Ten Commandments. Q. 42. What is the sum of the Ten Commandments?