The Greek dative, as the representative of the lost instrumental case, denotes that by which or with which an action is done or accompanied. It is of two kinds: (1) The instrumental dative proper; (2) The comitative dative.1504
When the idea denoted by the noun in the dative is the instrument or means, it falls under (1); if it is a person (not regarded as the instrument or means) or any other living being, or a thing regarded as a person, it belongs under (2); if an action, under (2).1505
Abstract substantives with or without an attributive often stand in the instrumental dative instead of the cognate accusative ( cross1577).
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].