To verbs denoting a state, and to adjectives, an accusative may be added to denote a thing in respect to which the verb or adjective is limited.
a. The accusative usually expresses a local relation or the instrument. The word restricted by the accusative usually denotes
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].