The Dative Case
The case of personal interest. It expresses the indirect object.
The Dative of Indirect Object
This use is closest to the root idea of personal interest. The one from whom or in whose interest an act is done is indicated.
The Dative of Advantage or Disadvantage
This use is very similar to the Dative of Indirect Object. The personal interest expressed by the indirect object is intensified. The Dative of Advantage indicates the person for whose benefit something is done. The Dative of Disadvantage indicates the person who will be adversely affected as the result of the action. “Against” will often be used in this translation of the Dative of Disadvantage, “for” the Dative of Advantage and “to” the indirect object. This is sometimes referred to as the “Ethical Dative”.
Dative of Possession
Personal interest is particularized to the point of ownership. There is no exact equivalent in English.