Is Luther’s insistence on the “for you” of the Gospel just an unprovable personal insight?

EPISODE #143: Ted asks about the value of Martin Luther insisting on the “for you” part of the Good News, with an eye toward Luke 2:10 (NASB). Rod talks about why Jesus came, what it means that His arrival is “for me” and for my good. ** NOTE: The Greek dative case can mean either “to” or “for.”