The Orthodox Study Bible repeatedly emphasizes the theology of adoption in its explanatory notes. This is laudable, since Protestants generally neglect this important way to understand our own salvation.
We know several adoptees personally, and it is good to meditate on the fact that we are all adopted sons and daughters of the King. In this regard, the Study Bible’s notes to Luke 3:23-38 (the geneology of Joseph and of Jesus) are particuarly moving: “Jesus was born to bring all mankind into adoption by the Father, and thus He affirms that a lineage of adoption is as binding and receives the same inheritance as a lineage of blood (Gal 4:4-7).”
(A good essay on this is C.N. Wilborn, “Adoption: A Historical Perspective with Evangelical Implications” in Sanctification: Growing in Grace, eds. Joseph A. Pipa, Jr. & J. Andrew Wortman, 2001. Wilborn quotes Robert Smith Candlish: “The more I think of it, the more I am disposed to regret that the subject of adoption, or sonship of believers, has been so little made account of in our Reformation theology. It seems to me to be the appropriate crown of Calvinism…”)