I’m very weak on this and I empathize with the Jews of the Old Testament:
[The Jews were] chosen in order to be a witness. They [were to] transmit the covenant faith to others, indeed, to the whole world. This understanding was difficult for them to maintain; time and again they slipped into the perception that their chosenness was to their own benefit. We understand this, of course, because throughout church history we Christians have so often succumbed to the same misperception. Not often by doctrinal statement, but by pattern of life and failure of mission.
Quoted from Christian Believer Bible Study, session 7.