(e) Error about the person injured, even though invincible, probably does not excuse from restitution, if the intention was to harm a class (e.g., Sempronius intends to kill Balbus, because the latter is a policeman, but by accident he kills another policeman) or an individual (e.g., Caius intends to kill Titus and by mistake kills Claudius, the twin-brother of Titus).
(d) Error about the thing injured, even though invincible, probably does not excuse from restitution, if the intention was to do damage (e.g., Julius puts poison in a plate in order to kill his neighbor’s dog, but the cat takes the poison and is killed).
1765. Restitution for Damages That Are Only Venially Sinful but Seriously Harmful.—(a) When one injurious act is committed (as when through slight carelessness one sets fire to one’s neighbor’s chicken coop), some deny, but others affirm, the duty of restitution, while still others distinguish according to the full or only partial advertence to the sinfulness of what is done. Of those who hold for restitution, some think that all the damage should be repaired, since all was caused; but others think that it suffices to repair part, since the culpability was limited.
(b) If several injurious acts, which taken singly are slight but taken together are serious, were done to the same person (e.g., a waiter breaking dishes at various times while working for the same proprietor), restitution is due as soon as the sinner realizes the amount of harm he has caused; but it is disputed whether the obligation is grave or light. If the injuries were done to different persons (e.g., a boy breaking windows in many houses in the neighborhood), there is more probably only a light obligation.
1766. Restitution on Account of Law for Damages That Are Only Juridically Culpable.—(a) Before sentence of court there is no obligation of restitution, for it would be too heavy a burden to impose this in view of the absentmindedness of so many persons and the numerous distractions one encounters.
(b) After sentence of court there is an obligation of restitution, for the law which gives the court a right to impose it is reasonable, since juridical fault is often accompanied by theological fault, and moreover men will thus be led to a greater prudence in the care of their own goods and in respect for those of others.
1767. Restitution on Account of Contract for Damages That Are Only Juridically Culpable.—(a) Express contract obliges to restitution even for light fault (i.e., the omission of precautions taken by the more prudent), or most light fault (i.e., the omission of precautions taken by the most prudent only), or, if so stipulated, for no fault at all.
(b) Implied contract perhaps also obliges to restitution for juridical fault, for it seems that equity requires one to make good the losses caused by the absence of a care which the contract took for granted. Thus, if the advantage is with the bailor alone (e.g., gratuitous deposit), ordinary care is expected and the bailee is not held in danger to prefer the bailor’s goods to his own; if the advantage is with both parties (e.g., onerous deposit or loan), it seems that more than ordinary care is demanded and that usually the obligor may give preference to his own goods.
1768. Restitution for Careless Discharge of Fiduciary Duties, as in the Case of Physicians, Lawyers, Spiritual Advisers.—(a) If there was theological fault, restitution is due, unless the injured party took the risk upon himself. (b) If there was only juridical fault, it seems there is no natural duty of restitution, since no injustice was done; but a court may oblige to damages.
1769. Two Cases in Which Culpability Seems Doubtful.—(a) When one has inculpably done or omitted something from which damage to another can be foreseen, and one has now become aware of the danger (as when Balbus lights a fire on his own property and sees that a change of the wind makes this fire dangerous for his neighbor’s barn), one must prevent the damage, if this can be done without equal or greater damage to oneself; otherwise one must make restitution.