On this second Sunday after Christmas, the lectionary reminds us of the blessing we have received through Christ--adoption, forgiveness, and redemption.
God has chosen to include us. (When this letter was first read, Gentiles would have understood that they were included along with the Jews could now look at God as Father. We who are used to the idea of Gentile being a sort of synonym for Christian may not get the impact of this thought or we may not be willing to extend the adoption to groups that just don't seem to be God's type of family.)
Our inclusion comes through grace. But, having been included, we can respond.