The dative of manner may denote the particular point of view from which a statement is made. This occurs chiefly with intransitive adjectives but also with intransitive verbs (Dative of Respect). (Cp. cross1600.)
ἀνὴρ ἡλικίᾳ ἔτι νέος
ἀσθενὴς τῷ σώματι
τῇ φωνῇ τρα_χύς
τῶν τότε δυνάμει προύχων
a. The accusative of respect ( cross1600) is often nearly equivalent to the dative of respect.
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].