For the notion of injury or injustice implies an immorality or vice committed against some other person: And as every immorality is derived from some defect or unsoundness of the passions, and as this defect must be judged of, in a great measure, from the ordinary course of nature in the constitution of the mind; it will be easy to know, whether we be guilty of any immorality, with regard to others, by considering the natural, and usual force of those several affections, which are directed towards them.