Summa Theologiae by St. Thomas Aquinas
SS: Treatise On The Cardinal Virtues
Q[66] Of Theft And Robbery
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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:

A[1] Whether it is natural to man to possess external things?

A[2] Whether it is lawful for a man to possess something as his own?

A[3] Whether theft is the secret taking of another's property?

A[4] Whether robbery is a species of sin distinct from theft?

A[5] Whether every theft is a sin?

A[6] Whether theft is a mortal sin?

A[7] Whether it is lawful to thieve in a case of necessity?

A[8] Whether every robbery is a mortal sin?

A[9] Whether robbery is a more grievous sin than theft?