In due sequence we must consider the vices opposed to commutative justice.
We must consider (1) those sins that are committed in relation to involuntary commutations; (2) those that are committed with regard to voluntary commutations.
Sins are committed in relation to involuntary commutations by doing an injury to one's neighbor against his will: and this can be done in two ways, namely by deed or by word.
By deed when one's neighbor is injured either in his own person, or in a person connected with him, or in his possessions.
We must therefore consider these points in due order, and in the first place we shall consider murder whereby a man inflicts the greatest injury on his neighbor.
Under this head there are eight points of inquiry:
A1 Whether it is a sin to kill dumb animals or even plants?
(2) Whether it is lawful to kill a sinner?
A3 Whether this is lawful to a private individual, or to a public person only?
A4 Whether this is lawful to a cleric?
A5 Whether it is lawful to kill oneself?
A6 Whether it is lawful to kill a just man?
A7 Whether it is lawful to kill a man in self-defense?
A8 Whether accidental homicide is a mortal sin?
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