We must now consider the sins opposed to justice, whereby a man injures his neighbor in his belongings; namely theft and robbery.
Under this head there are nine points of inquiry:
(1) Whether it is natural to man to possess external things?
(2) Whether it is lawful for a man to possess something as his own?
(3) Whether theft is the secret taking of another's property?
(4) Whether robbery is a species of sin distinct from theft?
(5) Whether every theft is a sin?
(6) Whether theft is a mortal sin?
(7) Whether it is lawful to thieve in a case of necessity?
(8) Whether every robbery is a mortal sin?
(9) Whether robbery is a more grievous sin than theft?