Some non-universalists, especially some Calvinists, appeal to Ephesians 2, thinking that this chapter somehow counts against universal salvation on the ground that no one, or more precisely no sinner, starts off in citzenship of the kingdom but are saved from their sins into loyal citizenship of God’s household by the grace of God.
Christian universalists wouldn’t typically disagree with that, however. Some of us (myself included) disagree that we were utterly not children of God before God saved us and merely ‘adopted’ us into His family; but that is because we (along with some Calvinists when they think this counts as testimony for God’s special election!) remember Galatians 4 among other places, where Paul clearly indicates that by “son-placement” he means the raising to family authority and responsibility a child who is already the son of the father (not at all “adoption” in the sense being usually appealed to here), although the child is treated as being a slave so long as the child is immature and/or rebellious.
Similarly, in writing to the Ephesians (most of whom were not previously Jews), Paul speaks in this chapter (v.19) of Gentile Christians no longer being guests and travelers (sometimes mistranslated as “strangers and aliens” as in the NASB) but fellow citizens with the saints and being of God’s household. The translation there is somewhat important, because guests and travelers are to be honored in Near Middle Eastern contexts!–although Paul does agree elsewhere, such as the beginning of the chapter, that as impenitent sinners we are alienated from God and children of indignation and sons of stubbornness.
Even so, there can be no absolute distinction here between Calvinist elect and non-elect, for Paul testifies that he and his fellow Christians were among the sons of stubbornness and children of indignation (vv.2-3)! Despite this, God, being rich in mercy because of His vast love with which He loves us, brings us to life together in Christ, saving us by grace, and rousing us together seats us among the celestials in Christ Jesus (v.4ff).
Along the way, at 2:17, St. Paul quotes from Isaiah 57, where God talks about how He punishes rebels even to death in order to lead them to repentance and salvation from sin, promising that He will surely succeed at this and so comfort both those who were punished and those who are mourning over those who have sinned. The result is “Peace, peace, to those who are far and to those who are near”, Gentiles and Jews becoming one people through the Messiah. (See comments on Isaiah 57.)
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