Chapter — Merkelbach, Summa Theologiae Moralis

Chapter III: On Injuries in the External Goods of Fortune

390.

390. Injury in the external goods of fortune is committed by theft. This sin supposes that external things are possessed by private persons as exclusively their own, so that dominion over them does not belong either to all in common or to the community in the name of all. Hence one must speak

390.
  1. of the right of privately possessing external things,
390.
  1. of the nature and gravity of theft,
390.
  1. of the causes excusing the taking of another's thing.

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